Way to go Chernabog!!!!! That's an awesome letter!
I've experience my first billing issue since the merger. I was overcharged by $25 and had a late fee to boot! I've never had a late fee with AT&T, not even when I was 2 months late and collections called me (I was moving and forgot about my bill).
I called them and they said it was impossible for their computers to be wrong, that they never make mistakes. When I said uhhh yea, I know several people who have been overcharged not to mention the countless people I've seen in the stores... it IS possible that your computer is wrong.
The guy I was connected too wasn't even a CSR guy and refused to transfer me to one claiming that once he had my call he wasn't allowed to transfer me to a CSR, he was only allowed to go to them for me and tell me what they said. Needless to say I was less than impressed and after about 10 minutes of arguing with the guy he connected me to a CSR and said "this is xxxx, she won't be able to do anything more than I can but you can talk to her if you wnat too:

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And every time I call they said "well you are on an AT&T contract". That's great. Now give me the AT&T level of customer care I am accustomed too.