Just got scammed by YeeYay of 0.15 btc.

I have posted proof here:
https://bitcointalk.org/index.php?topic=430648.460

and here:
https://bitcointalk.org/index.php?topic=430648.480

He is still denying it and lying but I have brought all the messages and transaction.

Please help me ban this scammer no other person needs to be left without money.