Child support

Does anyone know anything about child support?

I am so frustrated with our child support system. My sons father literally helps with nothing! So the courts pushed for me to do a reevaluation of the monthly payment amount.. I was only getting $150 a month. So I figured since it’s been years since we did an evaluation that maybe it would go up. Not to mention my sons father is working for his gfs company and I know for a fact that he is making decent money (he just bought a brand new 2019/2020 Dodge Ram truck and a car for his oldest son). So I was absolutely appalled when I received our new updated decision of $126 a month.. wth is that supposed to pay for?! That doesn’t even begin to cover insurance for my son on my husbands policy. I have a feeling his gf either wrote up what his income is or he is being paid under the table at his current job so he can hide his extra income.

So does anyone have any ideas or options for me or am I just screwed?