Can my Child Support be raised even though I am unemployed?

This is actually not about me this is about my fiance. I will make a long story short...He has been unemployed for 7 months now. He was terminated from his position. About 1 month ago he received legal documents for the Prosecuting Attorney's office concerning child support modification that was being demanded by the state, not the Mother! He had to fill out all the information stating he has no income and that I am the one with the income and that is how he is living. Now after turing that information in, it has been "ignored". He got a summons to appear in court next week and the documents with the summons stated that they are RAISING his child support from $325 a month to $650 a month. Regardless of the fact that he is not working. They are going based off of his last employment even though it has been 7 months since he worked there. I was not aware that they could do this!! Obviously he can't pay it! And so now it is just going to pile up in more back support. He still makes the state minimum payment every month so he is paying something at least! We tried to get a lawyer and had a consultation but he said that it would take fighting with the Prosecuting Attorney and could cost us up to $5,000. What are the laws and what can we do if anything?