No message - I assume it is an unwanted, unsolicited robocall

I received my share of this tele-scummer yesterday (7/27/15). Blocked!

No one talked and hung up after I said hello 3 times

9/15/15 11:25 PDT  "Good morning, this is Mike Thompson."  was out when call came in and as far as I know, am not acquainted with anyone by that name.  Had gone to voice mail and was an obviously robo dialed call and only started speaking after the noise indicating it was automatically dialed and the idiot was unaware he was announcing himself to a machine.

9/16/15 16:26 PDT  Just called again.  This time I was home and did not answer because no real ID.  Another miserable auto dial call with a fool who comes on line and expects an answer, seemingly not understanding there is no on this end.  I realized after yesterday's call that there is a "Mike Thompson" recreational  vehicle dealer, who advertises locally, quite frequently.  However, I have no intention of responding to any unidentified caller and am about to block this number, hopefully via no mo ro bo.