They call my home, but won't leave message, and sometimes won't pick up call if I do answer. Same number but comes up Nielson on my phone. They said they were Nielson Survey, and asked for the year my husband was born, if he was the primary financial decision maker, and total assets, then abruptly hung up.
I heard this advice from someone on one of these websites for unwanted numbers and it seems to work. When you answer from one of these numbers, I press 10 numbers and hold down on the tenth for a minute. It seems this tells the robo caller they got a fax and won't call back. Try it!