I’m sure Rollbit have a valid reason of restricting your account, are you able to contact the support and clarify this issue?
I wonder why OP would bother contacting support for his ban account because he has already profitted from the casino in question and I doubt if they are ever going to unban that account because they are going to see him as a scammer as he beat their promotion. If it were off line, he probably would be visited by the casino because he either took advantage of the loop hole on the casino. Although, it is the casino who have allowed themselves the laspes as they didn't realize early enough on what was happening.
The Op is very lucky and I don't understand what he is asking from the casino or he is encouraging other accounts to go through the way he went, I'm sure the casino will be on the look out for such violation.
So its still a win-win for the ops and I suggest he move on, but anyway, he already stated that the thread was meant to just warn others, who may receive such an offer from the casino.