I used to mystery shop for Martiz Research. They are a reputable company. It's not a scam. I found this website because I didn't know whose number was calling me.
Received a call claiming there may be a fraud transaction on our account using rewards points to book a flight. The call came from this number the voice mail gave a phony case number and the correct phone number for the visa card to make everything seem legit. These people are likely preying on the fact that when someone gets this call they are going to simply dial back the number that called them. Do not give these people your credit card number or even verify your SSN, they are going to try to scam you.
I work for GM, this number is used by Maritz, who runs a rewards program for GM as well as other companies. they called to let me know my order was backordered.