Improper Format Scammed out of $680

I got scammed out of 680 dollars, This is the guys steam profile, after the trade, he went offline and changed his name many times, I never got the money. http://steamcommunity.com/profiles/76561198065324839/
Please help.

Hello, your report seems to be improperly formatted and we cannot proceed with it in it's current state.

As such I'll reject it until you remake yours, please read the guidelines here: http://forums.steamrep.com/threads/...-look-at-acceptable-format-before-posting.51/

Thank you!