Texas office of attorney general Ripped of my husband for a $170.00 Temple Texas

The office of attorney general for child support is ripping my husband off for a 170.00 dollars. His ex wife was in prison. So we went to court to change the child support to her dad for my step son on Jan 26th 2017. His child support went from 340.00 a month to 700.00. On Feb 1st my husband's ex wife passed away. The attorney general flagged her account for closure. Which they still haven't closed. They didn't send a form to my husband's employer in time for them to stop sending money to his ex wife's account. One check went through for a 170.00. They told me they put it on her credit card on Feb 21st. Even though they were informed Feb 2nd about her death and they had flagged the account. That money should have went to my husband's ex father in law. They told me there is nothing they can do about it and that they won't give him credit for it. They told me to contact her estate. Which she doesn't have and they are the ones who made the mistake. He works his butt off to pay his child support and they just threw away a 170.00.