Some thoughts

Sorry I don't have much to add that you're probably not aware of already. There is an appeals process, but it sounds like you're past that and just need repayment.

You may want to contact the office of your local US congressional representative. They may be able to help.

If possible, you may want to adjust your tax withholding so you wind up getting a small or no refund. This will give you more current income, and reduce the chance of a refund being improperly seized.