First, why are you paying child support for an 18 year old in college? Unless you agreed to this at some time when the support order was entered, support as to your son has ended. So if you never agreed to support your son while he is in college and past age 18 you should have the wage assignment terminated immediately and you should have your son's mother reimburse you for the overpayment. If there are arrearages as to your son for support that ran before he turned 18 and finished high school, have any overpayment applied to those arrears.
Who do you owe the arrearages to, how much are they, and how are they being paid? More details would be helpful.
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