don't call the head office (they are quality control or something and their job is to try to resolve issues between pinelands and the client). go to their website and there should be a vendor relations form. The vendor relations manager generally tries to be impartial when dealing with complaints. there is a burden of proof, however. like, you can't just say they owe you $1000, he will investigate it and you need to have emails/etc. who is your coordinator?
Edit: He gets the form forwarded to his email that he checks daily. If he doesn't respond then he is getting more information from the state coordinator. also, depending on how busy your state is, the state coordinator may not have much work for you or (on the flipside) be working a ton of overtime trying to deal with issues in other areas.