My number is listed on the national do not call registry (November 2014) and I notified caller that I was not interested, to remove my number from their calling list and refresh their records when they called last Friday, 5/15/15 at 547pm.  Yet they just called again, 5/21/15 at 4:23pm.  I answered, " Are you really calling me again to try to sell me something?"  Caller disconnected.  I called the number back (same as last time) and reached recording of "Alex Carter."