The only thing you can do is report in the Scammers grave here: Scammer Grave - MPGH - MultiPlayer Game Hacking & Cheats - Hacks, Cheats, Downloads, Trainers, Games
If you have evidence, post in there. That's about all you can do. Sorry that you lost the account.
Before trades, use a middle man to ensure safe delivery.
And make sure to change your Email and never use the same password as before.