They don't give up and keep calling and calling

I just received a call from this number and no message left

They will never give up so I will never answer up. Caller ID is number one.

recorded msg that offers a free home security system due to increased break-ins in my area as reported by the FBI & local police

If you listen to the msg all the way through they give you an option @ the end to be placed on their DNC list.  I elected this option before so obviously it does not work.