Beware of high lv scammer/impersonator

Scammer's Profile: http://steamcommunity.com/id/848779238747472395275275275252/
Scammer's REAL steamrep: http://steamrep.com/profiles/76561197962850197
Scammers Steamgift's Profile (which is BANNED): http://www.steamgifts.com/user/SERZhKun

I should have checked him out in my browser instead of my steam app. But I didn't because his profile looked so legit. I foolishly traded my key for Assassin's Creed Syndicate(uplay) to him and now I'm left with nothing. He acted like he didn't use the key when it said the key was now invalid and called me an idiot when I called him out on it.

Only mid way though the trade did I take the time to look up his background. I find out that this guy is a repeat scammer, impersonator AND credit card fraudster. Then I find out his profile is impersonating somebody else RIGHT NOW. In fact the steamrep he lists in his profile is of the person he's impersonating.

I have no idea why steam doesn't ban these scammers while there's been SO much evidence against them. PLEASE BEWARE OF THIS SCAMMER HE'S STILL FRIENDING PEOPLE AND TRYING TO SCAM THEM!!! In fact he was trying to scam somebody else just 10 minutes after he scammed me. Report and block now before you fall victim.