Guy calling about a "free" "touchscreen" home security system

An automated phone call telemarketing a home security system. They call you even when they are on "closed" hours, so if they call before 10am and you call them back, the robot voice will say no one's available for business. When they are reached during business hours, an automated voice named "Andy" will ask you what you need. I've requested they remove my number off their system, get hunged up from, and get called again by the same number the next day, or sometimes even 3 hours later. Very annoying. I don't know how they got my number, but they've been calling it since February 2015 and call inconsistently. Sometimes 3 times a day, sometimes just once a week. I wish the number would stop calling me all together. Also it sounds like a scam telemarketer.

Have called 3 times in the last 6 hours. Didn't answer the first time and left no message. 2nd time my son answered and told the guy we lived in an apartment and didn't need a system and the guy hung up on him. Just called again at almost 9pm and I answered and told them not to call again and they hung up on me.