OP, can you clarify what specifically happened to your initial account? You said it got limited, they said it got permanently banned. Those aren't the same thing.
Did you receive any communications about being permanently banned and/or limited? Is the account still open and able to wager in the casino?
My first account got limited (amounts I can bet on NBA were smaller compared to the initial amounts) - not a single warning from Rollbit about not allowing me to create more accounts or anything. Hence, I just created a new account and deposited $10k. The new account got instantly limited without a single dollar wagered (I wouldn't bet a cent on sports). I contacted support to ask if I could withdraw it since there was no way for me to wager it through in sports, after which they started some KYC/AML process. I even offered them that I can wager my own deposited $10k through in slots, but they didn't even agree to that. Just decided to mock me with the "thank you for depositing money back" thing.