If you filed an incorrect or fraudulent return you need to correct it per the IRS rules. 

Why do they insist you amend your return ?    And why would it affect the Ex?

An attorney can threaten to complain about your actions or lack of actions to a judge, but the attorney cannot directly force you to do anything. But I am sure you already knew that.  If you want to understand how federal tax law affects your situation, you will need to give us more details.

make you - no. take you to court and or report you to the IRS - yes.