ohh damn.. thats shitty  i hope he will get right and will pay you back 
i alread made an twitter campaign and paid an user simply 10x times more than he should get... Anyways he was so kind and paid me back..
I  hope this will also happens to you.. next time.. beware of the scammers.. thoose fucktardos hustle everywhere 

good luck
regards
lama-hunter