Home Security Solutions - Harassing phone calls - 3 per week Nationwide

For months I have been getting calls from "Home Security solutions".   the pitch is that they are offerng a free upgrade to a wireless home alarm system.   I have demanded to be taken off of thier list, but they continue to call.   Im trying to find thier address to file a law suit, but whenever I ask, they immediately hang up.  what i HAVE been able to determine, is that by offering this free alarm upgrade, they require a 2 year monitoring contract at $49 per month fron Monitronics.   this means that they have an agreement with Monitronics.   I contracted Monitronics to complain and they said they would look into it.