I have already tried two other email address alternative to my main with the same result: no answer from them.
Of course I have always reported in every mail the order number and all other references that they could need to track down my purchase.
The funny thing is that if I check the order status on their site it still reports "awaiting dispatch" so I assume the local postmen that should grab my package from Vesalia are regularly killed along their way...
Seriously, I will follow your suggestions and will try to contact them by phone, I don't speak german so I will ask a friend to do that for me.
Let's hope this will clear things once for all, anyway I agree with lolof: very poor customer support...