Even if they proceed against you, all of your income and assets might be exempt from collection.

The remedy for an erroneous court ruling may be a motion for reconsideration or a writ/appeal.

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You need a new attorney and then consider a lawsuit or fee dispute against this attorney.

Probably not worth the expense but ask for a criminal attorney free consultation.

You obtain or Have your lawyer demand the papers she gave the school. Your family law attorney should handle all of this.

Its as in any case, your testimony, witnesses, emails, texts, etc.

Do a demand they stop and contact lawyers to discuss a lawsuit for wrongful collection.

In most states, such costs do not have a deadline or time limit.

Contact an attorney to sue them for fraud and or breach of contract.

Search online for filing claim of exemption. And discuss your case with a bankruptcy/debt expert attorney.