Well, that's the problem in my opinion. Anyone could say that then. In casinos, accounts are not always verified at the beginning, it's usually on the first or subsequent withdrawals, unless it's unusual. But if you have nothing to back it up, that's what would probably convince our team if it were true.
However, I'll try one more thing, if they missused your card, why didn't you contact the bank that these transactions didn't come from you? Alternatively, don't you have some kind of two-factor transaction verification? That's something that's probably the most common in today's world when situations like this can occur.
Also, did you try to describe to the bank what happened to you and ask for a chargeback?
It's probably not the best option, but on the other hand, if you didn't use the money, it might make some sense.
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