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If you have proof that you have paid the amount then you should call the number on the CP503. If you do not agree with this notice, call the IRS immediately at the number printed at the top of the notice. They will verify that the payment was made and received.
Sometimes (because these notices are computer generated) the payment and the notice may pass in the time lag for showing in the IRS system. You can call to make sure that the amount has been credited.
Please let me know if you need more information.If not then scroll up to see the STARS to rate so I am credited