Not only am I getting repeated phone calls from this number, the two times I did answer there was no one on the other end. When I don't answer, they do not leave a message.
This is a scam. They tell you that you've been entered into the "Dream of a Lifetime Sweepstakes" and ask you to take a quick survey, hoping to eventually get your credit card information. There's an article about the company here: http://voices.yahoo.com/avoiding-prs-sweepstakes-scam-580577.html?cat=3