That was my first thought, but as I still have a n00b status on the forum, I still can't send PMs. That's why I resorted to create a thread about the problem.
Anyway, I don't know if it was thanks to this post, or thanks to the facebook mesages, or thanks to the 15 support mails I sent, but the funds were finally unholded and released, only after 48 days, and after much screaming an kicking.
It is incredible that getting Bitcoins is still so difficult...