Home security system telelemarketing call, 29 sec VM on Work phone

This is a call saying something like "This is not a sale call. You have been referred by a friend for a free home security system installation..."
My phone shows this number is MO, USA. I got this call more than twice so I blocked it. Not sure if it can still call in from another number.

got calls from this number two times so far,  which I didn't answer. no message was left either time.  I only answer calls from numbers that i know.   i wish they would stop calling.

This is a home security company number.  They called my office a total of 10 times today.  So everytime they call now, I punch the 1 to talk to the person at the other and end and tell them "this is the 3rd call to my office from you today", "this is the 4th call to my office from you today", etc.  Let them see how it feels.   They don't seem to appreciate it.  Give them a dose of their own medicine.

they have called my home # several times I never picked up and of course the never leave a message. Another one to watch out for is portfolio recovery. At times I want to pick up the phone and blow a whistle, but better off ignoring these morons and soon you will be off their list to call.