I understand why this feels unfair, especially if you were allowed to deposit, claim the bonus, and play for many hours before the multiple-account issue was raised.
However, I wouldn’t necessarily say that the casino’s system had to detect a duplicate account at the time of deposit. Some casinos only perform deeper checks during KYC or when a withdrawal is requested.
What matters now is whether JW7 can explain why they believe you had multiple accounts and what evidence they are relying on.
Did they tell you anything more specific, for example whether the duplicate account was linked by your name, ID, phone number, payment method, device, or IP address?
If they only confiscated the winnings and referred generally to multiple accounts without giving you a clear explanation, I would ask them to specify exactly what rule they believe you violated and how they identified the second account. Keep all screenshots of the balance, the KYC process, the withdrawal attempt, and the message about the confiscation.
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