He is a swindler

Sorry to hear that, but please remove the link with his details - you may get suspended for calling out.
Instead, create a ticket for support, they will try to sort things out.
And, as always, check before giving gifts - this type of scam is pretty common, unfortunately =(

Yeah, sorry. You could have checked your winner on your giveaway page and found that the profile doesn't match. Some assholes around here.

Well when he added u, u should have asked his ID..... or check the winner profile in steamgifts by clicking his steam profile to check the user.(If its steamkey, the guy should not even add you... cos its obviously fake as u can receive the key here)