I took the liberty of calling the number back and an automated recording states the following:
"Hi this is Lisa with Reward Redemption. You recently visited one of our affiliate websites and in appreciation, we have a rebate card for you redeemable at popular stores like Walmart, BestBuy, Home Depot and many more. Press 1 now to receive your rebate card or press 2 if you would like to be placed on our do not call list."
Pressing 1 does connect to a live person (who I promptly hung-up on)
Pressing 2 plays a short recording that states: "Thank you for calling"