I just found out that I have overpayed my ex in child support by $5250.00, and DSHS child support division says it is not their fault, they never received the most current order that showed a lesser amount, so that extra amount, they said I could sue the mother over, but first of all I don't think she was aware of it either, and second of all, she doesn't even work, so I know she won't be able to pay that back. my question is my son is 9 years old, I still have at least 9 more years to pay, can that amount be used for future payments, as a credit so i woudn't owe anything for the next 12 months or so? Or how can I get a refund of that money?