Question

I live in Florida. I was hired for a sales trainer/manager position at a mortgage company. I worked a little more then two weeks, then gave my resignation because they were doing illegal loans, they owe me 3 days pay, 540.00. and the owner is saying he is not paying me,   He now also says he needs me to sign a standard contract that everyone signs, and I said why would I sign this contract since I no longer work for you and all I want is my money owed me.    What can I do , as I sent him three notices requesting my owed pay , and he said no way. I have this all in emails back to me,   My last email was stating that If I don't receive the money by a date, which has past, I would obtain a lawyer and he would be responsible for the fees and interest, as well as I would report him to the labor board and I also just found out there is an investigation going on with his company.    What can I do to get my money, what is my next step.