I DO believe Google has something to do with these calls. We get them on a phone line that we don't use and Google is the only company the number was given to when we first set up our Google+ business page. If it isn't actually Google, then it's companies they've sold the number to. Fargin bastidges.
This number calls our company all the time. It's automated. They mention how they have been trying to get a hold of us for awhile because we have an unclaimed google account or rewards of some sort. Do not pick up. It will be a waste of your time. It's very annoying. No one ever answers.