This number has called several times. It's a survey company wanting to know your opinion. They give a website if you call back as http://surveysampling.com/
This is a discussion forum where one can report or describe suspicious or unknown phone calls, but reporting them here does not stop the calling. YOU have to take action to do that! Consider buying a call blocker if nothing else works.
(google is your friend)
http://goo.gl/cdPm8O