Upon reading the OP one more time, I think there are some points to look at. First, I think a request to lock an account is not the same as being banned due to exploits. From here there should not be any problem with creating a new account unless the previous one is in self-exclusion.
Second, any account activity especially when it comes to closing an account should have an email message because there should be a confirmation chat as to whether to continue to lock the account or not. It would be hard to believe if there was no email about the account lock.
It is either @OP is hiding something and just wants to get sentiment and some support in the forum, I do not think Rollbit will scam him of the amount considering the casino is spending a huge amount of money in maintaining their signature campaign in the forum.
This should be the case if only his previous account were not banned. He is breaching the ToS by creating an account circumventing the restriction implemented on his banned account. I do not think it is the casino's fault to forfeit his winnings even his deposits. Evading the ban is already an abuse, IMO.
Second, any account activity especially when it comes to closing an account should have an email message because there should be a confirmation chat as to whether to continue to lock the account or not. It would be hard to believe if there was no email about the account lock.
It is either @OP is hiding something and just wants to get sentiment and some support in the forum, I do not think Rollbit will scam him of the amount considering the casino is spending a huge amount of money in maintaining their signature campaign in the forum.
I’m not trying to defend the OP here but I hope case like this that won using fair betting without any abuse should be reconsidered. 
This should be the case if only his previous account were not banned. He is breaching the ToS by creating an account circumventing the restriction implemented on his banned account. I do not think it is the casino's fault to forfeit his winnings even his deposits. Evading the ban is already an abuse, IMO.