Unfortunately I don't know a solution for your problem, however, I would like to take this oportunity to advice people who are on their 1st month with At&t and want to stay but not lock into a contract that they can come into an At&t store, return the equipment provided by At&t and provide your own phones, that will allow you to keep their plan without being in a contract.
This can apply as well to new at&t customers that want to get one of their plans but are not sure if they want to lock into 2 years.