Sounds like you're in Europe (judging that you transfered to a German IBAN). I recommend you go to your nearest consumer advise office or equivalent. Alternativ

Sounds like you're in Europe (judging that you transfered to a German IBAN). I recommend you go to your nearest consumer advise office or equivalent. Alternative if you're in Germany, talk to the ct magazine from the Heise publisher. They have a section in every issue about some consumer issues.