I had to do it after all. I had to go through the hassle of deleting a blocked number on our home phone so I could add a new number to block because... NIELSEN HAD TO BE BLOCKED.
513-696-1920
(Update to my Nielsen 'radio' survey calls below)
They called at 9:35 pm last night.
They called again at 7:35 am.
WTH?
About 30-35 calls a week. So... the fun wore off. Blocked them.