This is apparently a scam. Do not give them any information at all. (you would have to press #9 or O for their operator to get past the recorded message) I got a live person and told them I was tired of getting calls from them every day and before I could finish, they hung up on me. From what I understand, their ploy is to get your credit card or banking information.
You can get on the Do-Not-Call registry at the FTC by going to this site:
https://www.donotcall.gov
I have had multiple calls from three different phone numbers, they never leave a message but they keep calling. I did answer once and got the "lower your interst rate on a credit card" scam it didn't say which card. I am afraid to push any button on my phone with scammers and hackers involved because I've heard they can use the tones of your phone to charge your phone for other calls. They always call at the same 10:30am-11:30am time frame and usually on thursdays. The numbers on my list include 407-000-7437 , 407-000-3854 , and 407-000-8493. It really caught my attention with the 000. I've tried calling back all say it says is invalid number.