I've received multiple calls from this company eve...

I've received multiple calls from this company even though I have blocked their number and finally I answered so I could tell them to take me off their list. The guy asked if I had a security system and I said please take me off your list. He replied with "well that's not what I asked you" I asked again to be removed from his list and he said "Well I'm not going take you off the list if you don't answer my question."
At this point, this company is harassing me by calling me so much and then REFUSING to stop calling me. I will be investigating further ways to report them.