Chil support enforcement with held alot of money from my families federal tax return. they took too much. how can i get it back

Asked in Jennings, OK - about 1 year

we were paying to arkansas but last december my husbands ex filed in our state, oklahoma. the state was garnishing his wages, Oklahoma was in charge of sending it to arkansas. Arkansas' records show they got it but oklahoma s records show we paid nothing in the last 2 1/2 years. so they took 4200.00 from our refund. when we owed less than 1600.00. what can i do? and if i can somehow prove them wrong do they have to write my husband a check for the difference because that money was for a place to live and a car and we got screwed