If you already filed and did not include the prepayment, it's possible the IRS will figure out the overpayment and send it back to you automatically. It depends on how much time has elapsed since you filed the tax return - I would give it a few weeks after your return is processed.
At that point, if you have not received the money back and your return is fully processed, I would write to the IRS Service Center for your state and request that the funds be returned to you.
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