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You should go back and file a motion for termination of the support order. It will need to be done in the same court where the support was ordered. You will probably need to attach the birth certificates to prove the childrens ages as exhibits. The judge should create an order terminating the payment. You should then present the termination order to whomever is taking the money from you.
You could also try taking those birth certificates and the original order to whoever is taking the support out of your check (probably your employer) and ask them to cease taking the money.
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Please be aware that my answer is not legal advice, it is merely information and no attorney client relationship has been formed. You should always contact a local attorney for legal advice.