Had the same experience for the last eight days. He uses Google caller/voice as a cover. His email is mnamy@att.net and says he banks with Bank of America, be careful. The prior post confirmed my thinking.

I have a car advertised in on Autotrader.  He says his name is Sam and is from Dallas.  This man also uses the number 215-801-2039.  He keeps repeatedly calling me but each time offers the same ridiculous price.  He claims to be looking for a car for his wife.  But when I looked up the number he called me from today, 215-801-2039, other reviewers wrote he was an annoying dealer looking to buy cars for well below book price just to resell them.  Sounds like a scam to me and I won't be answering or calling him back.