I just got a call from this number. I asked him to not call back and he just kept saying hello hello acting like he couldn't hear anything when I told him to never call back again. I assume it is just another scam.
Talked to 'Jack Jackson' from 'Monster Alarm near San Diego'. He said that he can't take you off the list because they use a purchased calling list and robo-dialers. This was after I informed him I was on the DNC list. Obviously the DNC list is totally worthless