Lol, I was suspecting exactly what Firek said afterwards..

This is impossible, my friends give me those games (i paid) !!, I wanted to try the platform gog but at this point I'll never make purchases with you, on STEAM these problems there are.

Ma da dove azz li hai presi?
Quale account te li ha passati, poi?

Some friends. :P

If you bought the codes from a friend, then your friend probably purchased codes that someone else had bought with a stolen credit card, your friend likely didn't know that, but unfortunately that's the case. Your friend needs to get a refund from whoever they bought the codes from, and you should ask your friend to have your money back.

Well, did your friends buy those keys from GOG? In that case they would be legit.
Or did your friends get those keys from a shady unauthorized site? In that case you have no way of knowing whether the original purchase was legitimate.

On a side note, such things happen with every platform. On Steam, customers had their copies of Sniper 3, several Devolver Digital titles, and some more, removed because they bought them from unauthorized sites, and the original purchase was fraudulent. On UPlay, a large number of fraudulently obtained keys were revoked in January.

The problem is the fraud, not the platform. Make sure that you buy your games from authorized stores (GOG, Steam, Amazon, Humble, GamersGate) and these things will not happen.

Steam has done and will do exactly the same thing upon discovering that something was bought with a stolen credit card. And it happens way more often there than here on GOG...

Returning stolen property to its rightful owner is exceptionally rare these days. We consider it honorable to give someone their hard-earned money back when they've been robbed.

And although purchasing stolen property is illegal, it's usually done out of ignorance. Had you known those codes were stolen, you would have never bought them. And so you should be equally angry as the man or woman who had their money stolen to begin with.

So you should take your righteous fury and share it with your friend and go after the shady key resellers that took a developers, a distributor's, a stranger's, your friend's and your own hard-earned money.

So you did not know where these keys came from originally?

Beh.. in ogni caso il tuo amico dovrebbe ridarti i soldi per il pessimo affare che ti ha rifilato..

Of course not !, I would not have taken absolutely!
Lasciamo perde va 3 giochi buttati cosi...

Ma come lasciamo perdere.. ma quanto hai pagato?
Quei 3 giochi costano un casino! O_o

sounds like scammer with a cock & bull story..