Account frozen since 7 weeks

I used dcoin for 6 month or more, than I finally had some luck. I was able to do a test-withdraw (just to test settings), but the real transaction was canceled. Since than (7 weeks now) I can do nothing. All I try answers with "please contact customer support" .. they have 3 or more mail addresses, I write weekly to all of them but never get an answer. And the little support chat tells me they can't help, its another department I should be patient, my account is under risk-control :( .. I guess it is there business-model to freeze your account when you want to get money out