Called this number back and it turns out it's a telemarketing group claiming they give away $100 a day in gift cards and other prizes and that I was a "subscriber." There is an easy option they give you to cancel your "subscription," which I did and they said it would take 7 days to be processed. Hoping this means the calls will stop. It was all voice mail--no human contact.
Got a call from them. Wasn't able to to pick up. When I called back there was a voice message saying that my subsciption had been cancelled and my number removed from their database but they didn't say who they were. If it is a telemarketer than good riddance.