I blocked them after the above call, and yet they still call. Apparently their system does not respond to the official Beep beep beep, "This number is disconnected..." message.
I added them to my phones blacklist feature. Never hear a peep from them now. I do check my logs and see that they call, well try to call 2-3 times a week.
Received a call from this number for the first time. It was a recording asking for someone who I know had this phone number many years ago. I am certain it was a debt collector.