Well I don't want to sound rude but if someone doesn't speak my language then I'm not going to, under any circumstances, trust that individual with anything. Broken English, poor grammar, and confusing personal information (i.e. different names as you stated, odd phone numbers like 999-1010, unlikely addresses like 123 ____) all let me know that the buyer doesn't care about taking the time to follow through with a professional sale.
I highly advise you not to go through with the sale. Even though you acknowledged this I'm just making sure..