A local attorney should always be consulted when legal advice is needed. I have a friend who is losing everything because his cs is being based on income he is not getting. They are there to provide information to the ncp's as well as the cp's. See what the states laws are in regard to this. You should be able to research this further on the internet, also.
Most states have a website that shows their laws on the child support subject.
Good Luck, it is an uphill battle.