Often hang up when I answer, call back and get a busy signal

It is a law firm soliciting business for home loan modifications.

he said his name was cris but wouldnt say why he was calling

Just had a very rude guy named "Eric" call from this number. He would not tell me what the call was about. He just kept saying that it was a personal business matter.
I realllllllllly don't like these people......

The same guy actually called twice but the first time he hung up as soon as I put him on hold....