WARNING--BEWARE!! These callers are B I G credit card criminals, known as the card service scammers! Under NO circumstances, give these lowlifes your credit card number, or you will regret it forever!
Yep, it works for a little while, then they call back using a different phone number. What works to stop them is calling back to get their automated system; press 1 and after their 48 business hours processing time, the calls stop.