Divorced disabled-ex quartly taxes

I live in Indiana and got divorced last year. He is disabled and I had 1099s that required us to pay in quarterly taxes to state and federal. They had both of our names and socials on there. When I filed I only got back half of what we had paid in (we over paid by a lot) because they were giving him half. Problem is when he tried to file they said he can't because of his circumstances. We had agreed in the divorce that those quarterly payments would be given to me for this reason. How do I get them back? I was told he needs to release them. He was told they can't look anything up for him because he didn't file. I need help. The two combined is a decent amount of money that I could really use and paid in. Even though we were married it was my pay check that it came out of. Please any help would be appreciated. I used a small town/ local tax person and they are hard to get ahold of and get help from.