Called selling an alarm system

i didn't answer that phone call,but they leave a voicemail with out message cuz they dont even talk

Called back and continued to hear "We're sorry your call cannot be completed as dialed.  Please check the number and dial again or ask you operator for assistance."

This number calls me repeatedly after me telling them MANY TIMES NOT TO CALL!!!!!! I am not interested in any alarm systems and when you try to call the number back it does not exsist. What the heck can I do to get rid of idiots like this calling 2 and 3 times a day?  I am well aware that it is a scam and you would think by me getting pissed off at them and saying no that they would remove my number but they don't. Today the guys name was Brian....

They called around noon then hung up. It sounded like a call center.