You could also man up and admit that at the heart of your argument - you don't like that you signed a contract that up until now - was just fine and dandy. Now that ATT wants to actually hold you and others responsible for an element of that contract that you think you are entitled to - you want to cry "illegal."
Good luck. ATT would be better off losing you as a customer rather than dealing with the, no doubt, obnoxious posts and calls into CSRs you will no doubt make.

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JMB Racing/Aucott Racing#39;s Ferrari F430 GT2 in the 2008 1000km of Silverstone

JMB Racing#39;s Ferrari F430 GT2 at the 2008 1000km of Silverstone. photo: Creative Commons / Darren. JMB Racing#39;s Ferrari F430 GT2 at the 2008 1000km of

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A Ferrari F430 Scuderia at the 2008 San Francisco International Auto Show. photo: Creative Commons / BrokenSphere. A Ferrari F430 Scuderia at the 2008 San
Good luck. ATT would be better off losing you as a customer rather than dealing with the, no doubt, obnoxious posts and calls into CSRs you will no doubt make.