Uhm, sounds like a scam trade.
First of all, if you traded with elitepvpers, just go here:
But as I can see you did not trade with elitepvpers, just with an IM (Skype?). And now you can only go to the police department in your town to get him catched. They will care about that because sometimes they care more about the internet activitys as the reallife activitys ^^
Good luck.