The number called twice. I read not to call the number back, because it's a scammer trying to get me off the national do not call list. I'm glad I read that so I'm forwarding the message.
A robocall from Rewards Redemption Center - A search shows this number to be from Colorado Springs, CO. A land line using NEUTRAL TANDEM-COLORADO, LLC - CO. They keep calling using a different new number after being told to remove my number from their call list and blocked.