This number called a few times so I finally picked to tell them to stop calling. They were asking for feedback on a plumber I used, consumer satisfaction sort of call. I ended up giving the review and that was that.
For what it's worth, the person on the other end was polite and answered all of my questions.
I've been on the other end of these calls before so I participate in most surveys. They didn't ask for any personal information and made it clear they weren't selling anything.
I just got a call. It was a survey on a company I used in July. Seems Legit - they were asking grade scores and what I thought the company could do to improve. I wonder why they don't just look at Angie's List?