This number just called me and I answered-- an automated machine offered me the "opportunity" for a lower interest rate on my credit card, and that I should consider the message as a final notice of this offer. It then asked me to follow the steps to speak with an operator to make the interest rate change; I hung up.
Scam city, report this number to the FCC!
http://www.fcc.gov/complaints
I've adopted a policy of not answering unknown callers - glad I did too. Twice now I turned to Google to find out about the number and both (this one was second) had files on the calling number. Fortunately, I can now block the caller at will and "so it is written, so it is done!"