So annoyed and bewildered....

So...my husband has three children from his previous marriage...and the youngest one graduated from high school and turns 18 this July. Per his divorce agreement...his child support ends when the youngest child has turned 18 & graduated from high school. What I don't understand is why we once again have to hire a very expensive attorney to file papers through the court system so he can stop paying $500 a month. Don't they have little expiration dates on the files that says...oh...we won't send notices to this dude...he fulfilled his monetary obligation. No...if you don't pay...even though you are done per the court order...they will serve a warrant on your ass and then you have to drive all the way to Orlando for garbage. Moral of this story: It's cheaper to keep her!!!