Called cell and no answer

Called and did not leave a message on my answering machine. Thank God. Getting tiered of these call and hangups!

alarm sys scam,said he was calling from n.c.  BIG TIME SCAM

This was a sales pitch to see if I was interested in getting a wireless alarm system installed at no cost if I agreed to allow them to use it as part of an advertisement.  I told them no thanks and to remove me from their database.  I'm already on the Do Not Call list, but as we all know...that's not much good as telemarketers just ignore the list.

Called my home and I didn't answer. Caller id said Security Update. Left no message.