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I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear that this happened.
As long as he was not working for that employer on Aug. 20, you have the ability to file a Motion for Relief from Judgment, based on fraud on the court. You'd want to attach an affidavit from the employer. The judge would probably request a hearing, and you could subpoena the employer to come testify. If the judge finds that the support order is based on false or fraudulent figures, then he'll rescind the court order and hold a new hearing to determine the correct support amount.