They are pissed because i recently stsrted playing st one of their competitors casinos.
Why do you think this is the cause of the problem you say you are having, how can the casino know that you have another account in a different casino, is that even possible. Since this case is about VIP bonus, i don't think it should be too difficult to resolve, that said, i don't know anything about Shuffles VIP reward, maybe you can show us the criteria for the VIP rewards.