I am guessing that the lack of response to the thread from their English speaking moderator probably has to do with the holidays. Does anyone know how to switch the main aquacomputer website to English? I see a support (or what my limited German skills believes is a support ticket) but its all in German.
You should be able to contact support via info(at)aqua-computer.de.
I know that you should get what you payed for, but while you wait, the cables are nothing special, you should be able to get replacements anywhere and they are cheap. It is a standard internal USB cable and a 3 pin cable that you would normally use for fans, it just has both female connectors.
Kind regards,
Boris.