From what i have learned on this forum, the right way to solve a problem like this is directly with btcgosu. Try to open a thread there about your problem and they will act as the middle man to help you by solving the issue.

By the way, does Bitz.io tell you what rule you broke? or they only tell you that you have broken the rules and blocked your account?  The most common rules that users break on casinos are the multiple accounts and the arbitrage betting in sports.