This is a typical survey scam from a caller named Rewards Redemption Center. You are told you have been called for a reward and they want payment to activate your rebate card. They will not leave messages but only call then hang up so it shows on your caller ID. They want you to call back so they know they got a bite.
This company keeps calling me and harassing me at all times throughout the day even in the middle of the night. I've told them many times to get me off their list but they refuse. I don't want to change my number but this is driving me CRAZY.