Left a voice mail about lowering interest rates

The caller ID says Phoenix Arizona.  Other online notes say this is a credit card scam.  I tried calling them back with my number blocked.  Phone number not in service.  Of course!

Called my work cell phone; rang four time. Left no voice mail.

called I didn't answer left no message

This is still another credit card scam (lower your interest rate on your card...but they have no idea what card they are referring to). Basically they want to sucker you into giving them your CC#s and the only thing they will lower is the amount of credit available on the card...due to all the fees they charge you for their "services"...number blocked.