It's the "Lisa (or Julie or Andrew or Rachel) with Rewards Redemption" SCAM. You’ll be told they have a gift card for you (usually $100) for visiting one of their sponsors sites recently. Later on you’ll be asked for your credit card number to cover fees. It’s a big SCAM. Block it. If you want to have fun with them, ask them to take the processing fee out of the cards and just send you the remainder.
http://www.businessinsider.com/scam-offers-gi ... wal-mart-2014-1
http://www.scamcallfighters.com/scam-call-2092520226-Lisa-from-rewards-redemption--Automated-call-scam-Fake-Reward-12845.html