ATT customer service isn't only the worst out of all US carriers, it is the worst of any company I've ever dealt with. I remember, when I was looking to switch to Tmo (who are mostly awesome), I was ready to pay ATT any amount of $$ just so I don't have to deal with them a minute longer. Absolutely the very worst!
Tell me about it.
When I was on my way out and wanted to switch to Tmobile they drove me nuts for over 2 weeks.
I just wanted to pay them off and pay off my final bill and have them unlock my iphones as per their rules. Even though my final bill was paid off and due to the unlimited data plan price increase I was allowed to go ETF free they still wouldn't unlock them and would have me submit online unlock requests through their website that kept getting denied the next day.
They would give me the run around via multiple calls every day and hours wasted.
After an FCC and BBB complain they finally unlocked my iphones.
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I was with T-mobile twice and both times they treated my poorly.
In terms of best to worse in customer service I would say:
Verizon
AT&T
Sprint
T-Mobile
In general they have been great to me every time I called Tmobile.
And easily credit me back fees and complimentary service charges.
Towards the end AT&T's incompetence and attitude totally ruined it. I will never want to deal with them again. Probably because I was switching away and was not a customer any more they were trying extra hard not to help me after paying them for over 16 years of service.
And a few weeks ago I get an email saying my AT&T online account has been temporarily locked due to too many wrong user ID and password attempts

I guess someone tried to hack into it possibly.
But why is my AT&T online access still available over a year later since I closed my account?