I just had the exact same experience. They follow up with a "supervisor" that gives you a confirmation number and contact number supposedly confirming your lifetime interest rate reduction. I reported it to my credit card company; hopefully, their fraud department will investigate these clowns.
Just got this on cell again. About once every other week. I used to live in the 408 area so thought the first time it may have been something or someone I knew. NOT!
This # is a scam, so beware. The company offers to lower your interest rate on your credit card, but they do not have any information on which card they were calling about. They are scamming to get your account info. When I asked who they worked for they kept saying "Credit Card Services" and I kept asking for the name of the company and then they hung up.
Received a call on my cell from this number this morning. I did not answer and no message was left. Siunds like this is a credit card scam so I will be answering next time and they will get an earful. This is harassment.