AT&T does not handle it's own customer service at all. They subcontract all their service complaints to other businesses such as Alorica, Inc. and Consolidated Marketing Response in order not to deal with any and all complaints directly. These subcontractors have websites you can search for.
The people who work for these small businesses have no training to troubleshoot technical issues nor the real power to help any customer to full satisfaction. However the people who work for these small businesses are emotionally abused if they can't make sales quotas, they work long hours and are blamed for AT&T's shortcomings.
My wife works for one of these subcontractors and she has cronic health problems and their abuses are making her medical condition worse. She is also over the age of 50, which tells you they don't care about older workers at all.
She told me that AT&T, however calls back the customers that call customer service and if that customer does not say these exact words "I am very satisfied with the service I received" AT&T will have the representative penalized, even though the customer says they were satisfied.
So when you call AT&T bear this in mind, your not speaking to AT&T and your being lied to right from the beginning, and most of your issues will probably not be resolved and innocent people who don't even know how to help you will be abused when you complain.
I strongly urge people to boycott all AT&T's products and services until they stop their abusive practices against the consumers and the people they subcontract to take complaint calls from people they will not help.