Who called from 5136961920

I got a letter in the mail last week from the Nielsen ratings company saying I had been selected to rate radio stations in my area.  The letter warned me that they would be calling me in the next few days.  I was not interested and never replied.  They have now been calling me twice a day for the past four days.  They never leave a message.  I recently bought a call blocker for my home phone and have this number on the list to be blocked.  Unfortunately, the Nielsen people are undeterred.  I have an unpublished number and am on the do not call list.  I have no idea how they got my information.

}  My number is on the National Do Not Call registry- little  as that helps.

.... because the DNCR covers only cold sales calls, a fact you were meant to learn at registration time.

National Do Not Call Registry Q&A
http://www.consumer.ftc.gov/articles/0108-national-do-not-call-registry

So now Nielsen is going to start spamming my phone?

Just called 8:40pm. As I don't know who they are, I did not answer it.

This company does send you money for answering their questions and filling out their surveys. I have made a few bucks so far for simply sharing my opinions.