One call came in that we missed.  Called back and was told, "Not a working number."  Just had another from same number saying he was "Sam" (barely understandable) and we hadn't paid our bill at Con-Edison Electric (don't have any service with them).  He named another electric company, asking if we didn't pay our bills (we do, but not with that one either).  Then tried to find out why we weren't taking advantage of their "offer" (don't have any idea what that is).  Told him not to call again...we'll see.