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AT&T has a "known issue" as they called it. It's a billing issue and they will credit you back the overage. It took me five customer service reps and two stores, but I found someone who had seen it recently. Mine started this billing period. Four days into my billing cycle I used three times my typical monthly usage. They acknowledged the problem and said they are trying to fix it. Until they do just ask for a credit on the overage and they will issue it.