I've had that problem alot with my last phone number. And now it started happening with my new number. I dunno what to do other than change the damn number. It's stupid, and I had a guy call twice just to make sure. And I have to keep this phone on for emergency calls (I'm a sysadmin). I put this number on the no-call list which didn't do anything. They can probably get away with by saying they had no clue the number was reassigned and that they already had dealing with the person. This is a loophole of the no call list.