Scam recorded message : "your credit card ...blah blah...lower your interest rate." Didn't  even say which card they were pretending  to know about.

Scammers using robo-dialers just call all numbers in numerical order. They didn't specifically pick you.

Recorded message begins with woman's voice, ". concerning your eligibility for lowering your interest rate to as liltte as 6.95%.
Your eligibility expires shortly so please consider this your final notice.
Press one on your phone to speak with a live operator and lower your interest rate, or Press Two to discontinue further notices. Thank you and have a great day."
As I'm on the DNCall list, this is both a violation of that, and a probable scam to obtain personal information.

Spam

They left a message saying they were the IRS