Finally !
DAMIJAN MERLAK 10.11.2014 15:53:03
Dear XXX,
I have added 0.821 BTC to your Bitstamp account.
Best regards,
Damijan Merlak
Maybe the previous guy was in holiday, fired, or whatever.
In the end:
3 weeks after the ticket creation,
few minutes after a bitcointalk thread creation,
the problem is solved !
They should have fixed this within a few working days, they didn't even bother to say 'we're sorry that it took so long'...
People should contact Bitstamp also via this forum as that might speed up the whole process.