These people call me 1-2 times a week. I've never answered the calls but the frequency became irritating so I did a reverse lookup and learned that they are a company named "Madison Who is Who" in New York that produces "puff sheets".
They apparently do not look at (or honor) the federal "do not call" registry.
When I get some time this week, I'll change my phone system to forward their calls to the Feds.