How do I get money owed to me by my franchisor?

I have recently been a part of a franchise for a home health therapy company. I had to recently close my franchise due to continued problems with my franchisor who was doing my invoices and billing. When I reviewed my invoices, I noticed over $2000 of incorrect billing and money owed to me. I completed an invoice discrepancy form that my franchisor requested me to do and it has been 3 weeks with no response to my phone calls or emails and money is stilled owed for profits they did not pay me for and to correct them double charging me for visits. How do I go about obtaining this money without paying out more in attorney fees then money owed to me?