I called this number back and they offered information about their "Special Promotions" They try to trick you into answering the phone. Call them back and have them place your # on their DNC lit. A pain, but what can you do?
It's a scam. They pose as a credit agency. They don't identify any specific one and they ask for your credit card info so they can lower your interest rate. I knew it was a scam when I told them I don't have a visa or mastercard (they claimed I've been making my payments on time) so they hung up on me!