I was getting the same caller with 2 different phone numbers. The other phone number blog had a comment of this do not call service. I spoke to them last week Wednesday at 866-246-1796. When I asked, they said they provide this service to a small number of companies who want to minimize complaints and save time not calling people who don't want to be called. Good for them, good for me so I gave them the caller's phone number to confirm it's on their list and the receiving phone number to add to the do not call list. So far no more calls so I'm passing this on.
 May 06th, 2013
they called and left no message. not likely a legit caller... spam
 May 03rd, 2013
"Our records show that you have not updated your free Google listing"
 May 02nd, 2013