So my conclusion is that I have to send it back to aquacomputer. 
How to I do that?	
Send it back to our regular postal address:
Aqua Computer GmbH & Co. KG
Gelliehäuser Str. 1
37130 Gleichen
GERMANY
Please add a short description of the problem and a copy of the invoice. Depending on your location it might be possible that we have to charge for the shipping back to you.