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Do you still consider this casino reliable?
Actually didn't have any problem when playing on Rollbit since I only use one account and don't experience same situation as yours.
And by looking at the situation happened to you it seems you are still under investigation.
So I guess much better to cooperate with them then try to see if you can help to make the investigation became more faster.
Since if you avoid to declare those things they ask then expect maybe that you can experience delay of their response. Its hard to experience this stressful situation that's why I avoid using multiple account to avoid this issues.
Obviously it was looking like he has as issue with them, at first the customer care was repeated asking him to respond through his email and he said no one was answering his email and they now asked him to list all his accounts, meaning they are purely suspecting him of having more than one account already. I also saw a response they told him they've escalated his matter to higher authority, we know it can be stressful sometimes but he should be open minded while working with them cause they have their own suspicion.