How to contact AT&T Customer service?!! - DirecTV

Contacting AT&T has been a nightmare. Does customer service even exist in this company?? When I do seem to get through, I am treated rudely by the employees.
In October I tried to cancel but everytime i would get redirected or they would come up with some excuse and say they would call me back in a few (which NEVER happened).
After I managed to cancel, I get charged fees and im still getting charged for TV service that I dont have (the receivers were mailed since November!).

i never made any contract with DirecTV. However, when I tried to leave this horrible company when Uverse was still around, they agreed to not raise my bill. Of course they didnt come through, especially since I can't seem to be able to talk to any representative.

This question, "How to contact AT&T Customer service?!!," is about DirecTV channels, programming, equipment, and sports.