If you need to put a complaint to a UK-licensed online casino in writing, this page gives you a template you can adapt and the detail to fill in: your account information, the dates and amounts, what went wrong, the outcome you are asking for, and a request for a deadlock letter. A calm, complete written record is the strongest start you can make.
Why a written complaint matters
Live chat is easy to start and easy to lose. Messages scroll away, agents change, and you are left with nothing you can point to later. A written complaint, sent by email or through the operator’s formal complaints channel, does two things. It forces the operator to engage with a clear, dated account of the problem, and it builds a record you can rely on if the matter escalates.
Under the Gambling Commission’s rules, every UK-licensed operator must have a complaints procedure and must handle complaints fairly and within set time limits. If your complaint is not resolved within eight weeks, or the operator reaches a final position before then, you can take it to an independent Alternative Dispute Resolution (ADR) provider at no cost to you. A written complaint is what starts that clock and what an ADR provider will want to see. If you are not sure how the process fits together, our guide on how to complain about an online casino walks through it step by step.
One point of honesty before you begin: a well-written letter improves your chances of being heard, but no letter forces an outcome, and no outcome is guaranteed. What it does is put you on solid ground.
What to gather before you write
The quality of your complaint depends on the detail behind it. Spend a little time collecting the facts before you draft anything, because a vague complaint is easy to deflect and a specific one is not.
You will want your account details: the username or account number, the registered email and the brand name exactly as it appears. You will want the dates and amounts that matter: when you opened the account, when the problem began, the deposits and withdrawals involved, and the balance in dispute. You will want a short, factual account of what went wrong, in the order it happened. And you will want copies of anything that supports it, such as withdrawal screenshots, emails, chat transcripts and the terms as they read on the day.
Where your complaint touches self-exclusion or affordability, the timeline is especially important. If you asked to close your account or registered with GAMSTOP and were still able to deposit and lose money, set out exactly when you tried to stop and what happened next. Our note on what UK law requires when a complaint is not resolved and needs escalating explains why that sequence carries weight.
The casino complaint letter template
Below is a template for a written complaint to a UK-licensed operator. Replace everything in square brackets with your own details, delete any line that does not apply, and keep the tone factual. You are stating what happened, not arguing. Copy it into an email to the operator’s complaints address, or paste it into their formal complaints form.
To: [Operator name] Complaints Team
From: [Your full name]
Date: [Date you send it]
Subject: Formal complaint: account [your username or account number]Dear [Operator name],
I am writing to make a formal complaint about my account with [brand name]. I would like this treated under your complaints procedure.
My account details
Account username or number: [ ]
Registered email: [ ]
Registered name and date of birth: [ ]What has happened
On [date], [describe the first thing that went wrong, in one or two plain sentences]. On [date], [describe what happened next]. [Add further dated events in order. Keep each to the facts.]Amounts involved
Deposits in the relevant period: [amount].
Withdrawal requested but not paid: [amount], requested on [date].
Disputed balance or losses: [amount].Why I am complaining
[State the problem clearly. For example: a withdrawal of [amount] has not been paid despite my account being verified on [date]; or, I asked to close my account on [date] and was still able to deposit [amount] afterwards; or, I believe checks on my spending should have been carried out given the amounts and frequency involved.]What I am asking for
I am asking you to [state the resolution you want, for example: release my withdrawal of [amount]; refund deposits made after [date]; provide a written explanation of the term you are relying on]. Please also tell me, in writing, the outcome of this complaint and the reasons for it.If this is not resolved
If you cannot resolve my complaint to my satisfaction, please confirm in writing that we have reached deadlock and provide a deadlock letter, together with the details of your approved ADR provider so that I can escalate the matter at no cost to me.Please acknowledge this complaint and confirm the timeframe within which I can expect a full response. I am keeping a record of all correspondence.
Yours faithfully,
[Your full name]
[Contact details]
How to use each section
The structure is deliberate, and each part earns its place.
Account details
Lead with the information the operator needs to find you without a back-and-forth. The username or account number, registered email, name and date of birth let them open your file straight away. If you cannot remember your account number, the registered email is usually enough.
Dates and amounts
Be precise. “A while ago” invites delay; “on 14 May” does not. Set out the deposits, the withdrawal you are chasing, and the balance or losses in dispute as plain figures. If you cannot be exact, say “approximately” rather than guessing a false precision. The point is a record the operator, and later an ADR provider, can check against their own data.
What went wrong
Tell the story in order, in short sentences, and keep emotion out of it even when the situation is distressing. A factual sequence is harder to dismiss than a long account of how it felt. If several things went wrong, number them. If the operator relied on a specific term to refuse a withdrawal or void winnings, name the clause and ask them to justify it.
The resolution you are seeking
Say plainly what you want to happen. A complaint without a requested outcome drifts. Whether you are asking for a held withdrawal to be paid, deposits to be refunded, or simply a written explanation, state it. You can ask for more than one thing, but be realistic, and frame it as the outcome you are seeking rather than an outcome you are entitled to assume.
Requesting a deadlock letter
This line matters more than it looks. A deadlock letter is the operator’s written confirmation that its complaints process is finished and the two of you have not agreed. It is the document that lets you escalate to an ADR provider. By asking for it up front, you signal that you understand the process and you save yourself a second round of correspondence if the answer is no. The operator should also tell you which approved ADR provider it uses. The long-established ADR body in the UK gambling sector is IBAS, the Independent Betting Adjudication Service, which has operated since 1998 and is recognised by the Gambling Commission. Where an operator is registered with IBAS, an IBAS decision is binding on that operator up to a published limit.
The record-keeping note
The closing line, that you are keeping a record of all correspondence, is not a threat. It is a quiet statement of fact that tends to sharpen the response, and it is true: you should be keeping that record from the first message onwards.
What happens after you send it
The operator should acknowledge your complaint and give you a timeframe for a full response. Many complaints are resolved at this stage, particularly where a withdrawal was simply held behind verification that you have now completed. If the answer does not satisfy you, you do not have to accept it as the end. Once you have a deadlock letter, or once eight weeks have passed since the operator received your complaint, you can take the matter to the operator’s approved ADR provider, which is free to you.
Be clear about what the Gambling Commission does and does not do. The Commission regulates operators and can act on patterns of poor behaviour, but it does not adjudicate individual disputes and it will not order a refund for you. That role sits with the ADR provider, or with the courts. Knowing this saves you from sending your complaint to the wrong place and losing time.
If your complaint is not resolved through the ADR route, or it concerns conduct that goes beyond a single transaction, such as being allowed to gamble after you self-excluded or far beyond what you could afford, there may be a further route. Our guidance on how to escalate a casino complaint sets out the realistic options.
A note on offshore and non-GamStop casinos
This template is written for a casino licensed by the UK Gambling Commission, because that is where the complaints ladder and the free ADR route apply. If the operator is offshore, that is, not on the UK public register, the picture is different. GAMSTOP self-exclusion does not reach it, there is usually no UK ADR provider behind it, and the formal escalation routes are narrower. You can still complain in writing, and you should, because a clean record matters even more when the usual protections do not apply. But manage your expectations about how far the operator will engage, and treat the written complaint as evidence-gathering as much as resolution. Where an offshore operator let you gamble after you had tried to stop, or allowed losses far beyond your means, a recovery claim may still be possible even though the standard complaint route is not. A free eligibility check can tell you honestly where you stand.
When a complaint becomes a recovery question
Most complaints are about a specific transaction: a held withdrawal, a voided bet, a verification dispute. Those belong with the operator and, if needed, the ADR provider. But some complaints point to something broader. If you were allowed to deposit and lose money after self-excluding, or if the amounts and frequency of your play should have triggered checks that never happened, the question is no longer just about one withdrawal. It is about whether the operator met its duties to you. That is where Clinton & Co works as claims specialists alongside regulated legal partners. You do not need us to send the complaint letter above; you can do that yourself, at no cost. But if the answer you get suggests a wider failure, you may be able to check your eligibility for a recovery claim. The initial check is free and confidential, and no outcome is guaranteed.
If gambling is causing you harm, free and confidential help is available now. Call the National Gambling Helpline on 0808 8020 133 or chat to GamCare (gamcare.org.uk). To block gambling sites across your devices, BetBlocker (betblocker.org) is free, and you can self-exclude from UK-licensed sites through GAMSTOP (gamstop.co.uk).
Sources
- Gambling Commission, “Handling complaints and Alternative Dispute Resolution (ADR)” and the complaints and disputes requirements, including the eight-week time limit and deadlock position (gamblingcommission.gov.uk).
- Gambling Commission, “Taking your complaint to an Alternative Dispute Resolution (ADR) provider”, on the free ADR route and the deadlock letter (gamblingcommission.gov.uk).
- Gambling Commission, LCCP social responsibility code provision 6.1.1, complaints and disputes (gamblingcommission.gov.uk).
- Independent Betting Adjudication Service (IBAS), how to raise a dispute and the scope of its adjudication, including binding decisions on member operators (ibas-uk.com).
- GAMSTOP (gamstop.co.uk). GamCare and the National Gambling Helpline (gamcare.org.uk). BetBlocker (betblocker.org).
General information, not legal advice. Clinton & Co Advisors is a trading name of Ramays TA/Clinton and Co Limited. We are not solicitors or a law firm. We connect clients with regulated legal partners.