Person calls repeatedly and hangs up.

Peter Viglione calls and asks for a person within your organization by name.  He represents that he's with the firm of John Thomas.  When you tell him that the person he asks for is not available, he rudely hangs us.  Thanks to caller ID, I was able to return the hang-up call.  He didn't answer with a 'hello'.  He just said, "I'm sorry.  I called the wrong number."  Then he hangs up on you again.