Hi,
the best time would be to call between 16.00 (=4 PM) and 18.00 (6 PM) German Time. The phone-nr. is 0049-5508-9749-290.
Another thing, which is much easier is writing a mail to
support@aqua-computer.de.
Here is nobady, who could help you, so it would be clever, not to write any personal information :
.
Regards
x-stars