Not quite credit card fraud, but still pretty intruding.
My ATT online Access & customer Proprietary Network Information (CPNI)(Their words, not mine) was hacked along with many others. I noticed and reported the issue to ATT in January. They just sent a letter at the end of February letting me know the information was taken, and that my on line ability to view my bill and usage was locked. In order to fix this, I needed to get to an ATT company store so they could verify who I was and take the lock off. Inconvenient, but doable and has been done.
I knew something was wrong because I got a call from "ATT" asking me to text them a pin number and they would give me a discount on my next billing cycle. BS for two reasons - ATT does not call, and I don't think ATT would give a one time discount. Shortly after that call, my wife got a text asking her to text back the number because of some maintenance issues with the tower in our area. BS again. Bottom line, all five of my lines were called/texted asking for a number to be texted back to them. (I still haven't figured out why they would want me to send them a number back that they sent.) So, somewhere, there's someone who knows my cell numbers, billing address, and other customer information.
Bottom line: If someone calls/texts from ATT and asks you to text/say a number back, something is not right. Be aware of the scum clowns - they're everywhere.