Help?

Ask him to provide you the correct games, if he refuses then mark as not received after 1 week pases, also if you mark as received something you never received, like incorrect game, you can get suspended for non activating a won game, marking as received assumes you activated the correct game.

He would have to submit a support ticket I think to cancel the giveaway. Once cancelled he could do another, but you probably won't win it.

I've heard of cases where if creator of the giveaway contacts SG support through a ticket, you can actually have the giveaway changed to the proper game. But those are rare and it's been a long time since I read about any of those in the forums, so I do not know if they still do it. But do NOT mark as received, since you did not receive the game the giveaway was created for. You need to contact him and work it out with him. And if he chooses to not give you the proper game or refuses to contact SG support to figure out a proper resolution, mark it as not received when the time comes. IF you leave it unmarked or mark as received, YOU get in trouble.

He doesn't have to delete the giveaway - he can ask to have the game changed.

"Change Giveaway Game"

well i submitted a support ticket, lets see what happens from here, thanks for your help :)

I believe the creator of the giveaway has to put in a support ticket with the category "Change Giveaway Game" It may work with your ticket as well, I would include a link to the post you did in the giveaway when you make the ticket.

You entered this giveaway right
http://store.steampowered.com/sub/460/
Have you spent points for the other game? - NO

He made the giveaway for the game he gave away so he is correct and you received that game. So no need for support or deleting or anything. The giveaway is correct.