Huh? I have ATT U-Verse and their customer service has been exceptional. If I have a problem, it’s sometimes same day, or next day, service.
I’ve heard mixed reviews of ATT (yours being one of the only positives I’ve heard). Several co-workers have them, they absolutely hate ATT, but won’t switch to Comcast because of the known CS issues Comcast has.
FWIW I’ve never been an ATT customer.