I just received a call from this number. It was a recording saying that they were cardmember services (didn't say what card or company) and that I was eligible to lower my interest rate to 6% and this offer was only available for a short time. It asked me to press 1 to be transferred to a representative so that I could take advantage of this offer. Since JP Morgan just had a major information hack, I figured it could be a scam and I hung up.
The "Cardmember Services" or "Card Services" scam has been going on for a long time. Anyone foolish enough to give out their credit card information to these people – there are multiple gangs operating this scam – is in for a world of financial hurt.