All depending on the time frame, you may be able to file a Motion to Correct Error. I would suggest you run a new child support worksheet (online) and see what the difference per week would be. It may not be enough to make much of a difference in the final weekly child support amount. Contact an attorney to see if you can get this taken care of.
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Sonya's suggestions are correct, but you also need to determine if you presented sufficient evidence at the hearing. If you did not present your pay -stubs and W2 at the hearing, how was the Court to determine your correct income?
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I totally agree with my esteemed colleagues, I just want to add that if you cannot do a motion to correct errors you may be able to petition to modify support. Speak with a local attorney first.