thanks for the tip. But no way, still "We are sorry: Provided coupon code had been already used. Back". Both codes that I've send to the Support last week.
And of course no even single word from the Support since last Monday.

I hope it all works out for you, but man it would be nice to win a promo code, especially one that worked! :o)
What game are you going to get if you get it working?

Actually? Sanitarium and Obscure.
As a matter of fact, it wasn't like "win a prize". It was just promotion: buy several retail games and register them - you'll get promo code for one free GOG game (or another retail game). So I've bought this code, not won.
Another working day in Europe is almost over now, still no answer, no working code, no free game. What a promotion!!!
edit:
codes were reset about two hours after this post.
Got my games now (Or maybe got it on my account actually - download is really slow tonight).
And unforgettable holidays too.
Thanks a lot.