If thats the way he's trying to solve this problem, I think Espionage, u just go and talk to his mother and settle with his mum. Ask for a refund from her instead of her son who is so damn irresponsible.

Anyway, a little suggestion here.. I think its better for u to put down the photos of his house. After all.. he's staying with his family, so its a bit.. hmm, yea I think u should understand.