Advice on Child Support Wrongdoing.

So here is the situtuation, and I need some serious advice about it.

In 1997, I moved to my dads house in TX and my parents had all child
support charges dropped and turned into joint custody, and all child
support charges are now void. We have documentation of that.

So in the middle somwhere, Between TX and IL, Child support charges
were NOT dropped. They have been taking money out of my dads check for
almost ten years now that i've been living with him. He's been to
court, and had it dropped AGAIN. There is documentation on this too.
But the funny thing, is that my mom has never gotten a check from the
child support agency since the first court date.

Just this saturday, they sent us a message saying they were going to
levey our possessions to pay for the child support. They have also been
taking my fathers income tax. There has been 2 letters, each with
incorrect values of how much we owed left.

We're speaking with an attourney yet again, but now i'm 18. I was
wondering if I could sue the state of IL for the money they owe ME. The
money that was not sent to my birthmom out of my dads checks and income
taxes. I've been living like crap because of this stupid ordeal, and
i've had to pay for my own things I needed. I have crappy job working
at a computer store and I have got my own car, I buy my own clothes,
pay my bills, and I can't pay back student loans for college. I'm
blaming the state of IL, becase they have screwed over my family
royally, and I was wondernig if I could get it back.

They are still charging him, for your information. And i'm going to be
19 in may.