Not a deadbeat dad... What to do with parental alienation from ex-wife?

Hello, my husband and his ex-wife just went through a modification to their original divorce decree. This new parenting plan made significant changes to their arrangements regarding their 12 year old son. The reason he took her to court originally was to modify child support. He was paying her 82% above the state guideline amount for 6yrs. and could no longer afford to do that. She was also violating basic rights to communicate anything with my husband and did not feel as though he deserved any rights even though he is the child's father. So what should have taken a few short months to modify, turned into 1 year. She refused to hand over her financials and so everything was delayed. Fast forward to now, the judge is upset because her lawyer still has not submitted their mediation agreements so we are still paying 82% over what is required by the state. We are financially and emotionally sucked dry! I say "we" because I have to work full time night shift just to keep a roof over our head! There have been serious issues with parental alienation here and her own lawyer had to make her agree to email my husband to communicate because she wouldn't use any form of communication at all. As of yesterday she emailed stating that she will no longer be receiving any emails from my husband. (we are assuming that means she blocked them) and that she will only communicate over the telephone(no texting) or in person. So she wants no paper trail. What can he do?