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But they are really certain that your accounts are link, then they should be able to provide some proof to you or through a mediator. I hate how some of this platform advertise as being decentralized, yet they still have the ability to block your funds.
I covered this part on the other [older] case. Even though signing up doesn't require credential and other details, that we only need to connect a wallet, the balance and winnings we get from the platform does not directly tied to our wallet. We still have an account on their platform from those wallet-sign-up, the balances are still stored on that account and need to be manually withdrawn.