Who called from 5080000000

I admit, I was suspicious when 508-000-0000 came up on the Caller ID just saying MASSACHUSETTS, as I've gotten plenty of spam & scam calls recently.
However, this # represents the Nielsen Homescan® Consumer Panel (www.homescan.com), something I did sign up for.  
The 1st time they called they didn't leave a msg so I thought they were a telemarketer.  But today they started to leave a msg w/ my name & pnl ID# so I answered.
Be careful if you've signed up for any survey pnls...often they will try to get you to join others, and perhaps that is how Nielsen got your #.

Recorded message from Comcast Cable about returning equipment. I don't answer calls from unknown callers

I have had calls from HP call centers and this was the number that showed up on my caller ID.

Recieved call from 508-000-0000 daily past week -no message left very annoying.

Well, seems the (508) 000-0000 phantom number is back in play!  At 4:55pm, June 22, 2013 I received that number with "MASSACHUSE CALL". Wtitten above it. Did not answer, and no message was left, and this came in on my HOME TELEPHONE 'UNLISTED' for over 3 yrs now! I have a restraining order on an ex...so the bill is not in my real name !