First decide whether you authorised the payment
If a card payment is unfamiliar or was not authorised by you, contact your bank or card issuer promptly through its official app, phone number or website. Explain what you recognise and what you do not. Follow the provider’s process for stopping further payments and investigating the transaction. Do not use a number sent in an unsolicited message.
If you authorised a deposit but later disagree with the operator about the gambling transaction, that is not the same as an unauthorised card payment. A dispute about a withdrawal, account balance, bonus term or transaction outcome should first go through the operator’s formal complaint process. Eligible unresolved disputes may then be referred to an approved ADR provider.
A chargeback is not a way to reverse gambling losses simply because the result was disappointing. Do not describe an authorised payment as fraud. Ask the bank what dispute category fits the facts, and ask the operator for its written explanation.
Keep transaction dates, amounts, merchant descriptors, bank case numbers and operator replies. Do not share full card details, security codes or one-time passcodes in a public complaint or chat. For formal escalation, see complaints and ADR; for a declined card transaction, see deposit declined.