Well, I didn't get 30$ ~0.08 btc. it was a valid deal so I'll give this guy negative trust.
I just did not put negative trust to this villain, because I have no way to prove I sent email and BTC address.
if not, he was already negative trust since yesterday!
Well, I've poof that I've sent my both fb & twitter accounts in mail plus my btc address. but got nothing.