I just received a call from this number and they asked for Mr. Mylastname which of course there is no Mr. Mylastname so my fiance tells him his name is John but not Mr. Mylastname.  He said he would call back later and hung up.

Same thing happened to us.  We are on the "do not call" list.  Man called from (813)793-7639,asked for me by first name, wife responded I was not home, but could she help, he said "no, will call back at a better time", then hung up when she asked who was calling.