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This would be grounds to petition the court to modify the child support order. The Georgia statutes at Section 9-11-60(g) allow a party to motion for relief from a judgment where any part of the record contains errors arising from oversight or omission. You may be able to get the order corrected retroactive to the date the order was put in place. Although retroactive orders are usually not permitted, they may be if the judgment was based on error. Your attorney should be willing to help you with this, being that it was his/her mistake.