Florida Department of Revenue

I moved to Florida a little over a year ago, I switched from Ohio to Florida child support. It has been nothing but Chaos since. They owe me about $500 if not more from last year. I have called and complained to the company multiple times since March about paying me that money. Only thing I get is this needs investigated and someone will get back with me. I never receive a phone call back and they still owe me money what do I do?