I just received a call from "Joe"  He said he was responding to my recent request about social security benefits.  I told him that he must have the wrong number because I had not made any such request.  So he hung up on me. Very frustrating!  This is like the 3rd or 4th call I've received today.  I have children and answer most numbers as the one I don't may be an emergency for the one of them.  I am on the do not call list.  Why does this keep happening?