This is getting very confusing. I will try to explain a few things and the rest is up to the timeline.
1) a lawyer is not like a mechanic or doctor or anyone else in the sense that once you hire one to represent you you have to go through specific hoops to stop actions. In your case since you were represented already unless you got paperwork from your lawyer showing that you were going to represent yourself for a hearing or response then it may be invalid.
With other professions you can drop and run and do what you like but in the legal profession that's a huge no no.
2) He filed a praecipe (which I don't understand)
Ref:
Praecipe - Wikipedia, the free encyclopedia
Fancy term for motion/or writ to show caus in an action.
3) The timeline is the guideline for your case. Depending on where the initial order was filed and dates / times of actions. In other words it is now a big mess to be sorted out. And yes its going to cost money because every time your lawyer picks up a phone or writes a letter etc then there is going to be a charge for it.
The bottom line is depending on how you want to play it then you might not want to dismiss the action but run with it so he can't be avoided. Hes against the wall at this time and the longer it drags out the more expensive its going to be. If child support is only 100 or 200 dollars then imagine how much catching up its going to take with a $5,000 lawyer bill on your hands.
Figure out what you want and the most quick way to get there.