Как узнать размер алиментов? Лишили прав, что делать?

Ex calls me this morning “how much do I owe in child support my license is suspended” I proceed to tell him the amount he goes oh that’s it! Like dude we’re not talking about 100 dollars here. He then yells at me you need to go to court and drop this case. Mind you he’s been paying since our son was 2. Men are just plain stupid sometimes. Might I add he has kids with 4 diff women.