This is a real company offering you a real service. There's something to win and a list to be taken off of. There's a reason to talk to them. Try to gain more information so you can "report" them or something like that.
It's not a scam and thus the Do Not Call list applies. Don't ignore what they're saying about a prize or offer or anything like that. Treat this like a person on the street came up to you and said "Can I give you my credit card number". Have fun, kids.