The perplexing part is that I was never informed about the ban when my ex closed the initial account. Had I known, I would have refrained from further deposits. Seeking advice on potential resolutions and exploring oversight from a gambling authority for crypto casinos seems prudent, given the circumstances. It appears unjust to be notified of the account ban only upon attempting to withdraw, especially after multiple deposits and losses.
If your story is true which the banned account is due to self exclusion then you have the right to get your money back since you attempted to reactivate it which means you are willing to remove the self exclusion. Your only mistake is you didn’t inform the support using your new account about your previous banned account.
Your case is very peculiar and I really hate casino that use this kind of excuse as trump card to forfeit someone winning just because of lousy excuse about connected account. Casino will not bothered if you lose your money yet they will forfeit your winning using this secret issue once you withdraw.

This is why playing without any minor issue about accounts should be a must before you deposit because casino will surely use their ToS once you win against especially if the amount is huge. Rollbit reps is very active here so he might help you to win your case assuming you are really telling the truth.