Where are you from btw? Your email is in German, but your PC's local language seems to be in Dutch. "Deels bewolkt" isn't German, it's Dutch and means partially cloudy. According to Coinplay TOS, players from the Netherlands and its territories are restricted from playing on Coinplay. I am not sure if that has anything to do with the problems you are experiencing. When they mentioned multiple accounts, you might have used VPNs (the same ones other players used) to bypass that geographical restriction.

Obviously, you aren't going to admin if that is the case, and I am not accusing you. It's just an observation I made based on the screenshot you posted and what the casino's TOS says. But none of that explains the horrible way Coinplay has decided to deal with this situation.