I called the number back, recording; "Hi this is Lisa with Reward Resolutions, you recently visited one of our reward vendors and have won a $100 Visa gift card. Press 1 to speak to a representative, press 2 to be placed on our Do Not Call list"
This is a scam.
They will claim you won this voucher and a family savings guide. They will then ask for $3.89 processing fee and your credit card number & email address with the "promise" you will be emailed your $100 voucher redeemable at any major retail store. After they have your card number, you are a victim.