They keep calling me and I have never answered the phone, nor never left my number to call me at.  I really wish there was a way to block a number on the iphone, or with AT&T.  And so to fix things myself, I finally had to create a silent ring tone and add the number to my contact list and set the special ring tone for that contact to SILENT.  And so they can call all they want I simpy will never hear the phone ring.