Did a quick search and this came up:
"DO NOT ANSWER, and if you can, REJECT the call before it goes to voice mail. They are phishing for live telephone numbers, and if you answer or it goes to voice mail, then they know that the number is good, and then your number will be added to a list and sold to others. "
I called the number back from my missed call list and it was a recording that said it was Lisa with Reward Redemption. The recorded message claimed I visited a website of their associates and they wanted to give me a $100 gift certificate in appreciation. Scam.