Gotta love scammers...they'll try anything. DON'T ANSWER IF YOU DON'T KNOW THE NUMBER! Let them leave a message, then look up the number here, then BLOCK the number!
Just received the same call. Did not answer but let it go to the answering machine. The person said it from "credit card services" underwriting department and based on my recent payment activity I qualified for a lower rate and provided an 800 number to call back.