Received a call at 4:15 and only answered because I thought the number looked familiar.
It was a lower voice (male?) from "An Independent Research Firm" I asked to be removed from their list. He continued to talk, I continued to ask / tell him to remove me from the list.
Received a call from the same number at 4:18
I was a higher voice (female?) from "AR Research" I asked for a number so I could call her back and was told it was not an incoming number but I could provide a better time to be called and I would get a call back.
I advised them to remove me from the list and that I had just received a call from the same number moments ago, had already asked to have my number removed, and now I was going to report them.  I reported it on the DoNotCall Registry.