I answer they hang up, I call back get an automated system no company name, I put my number on their do not call list thru the system they still call, I try to talk to someone get a voice-mail, and they are still calling!

" I put my number on their do not call list thru the system"  Which means that you confirmed your number is good and that someone is answering it.  In our experience that gets you more calls not less.