Jacksonville Check Cashers

I cash my payroll checks with this company all the time and just recently I recieved a fake $100 bill. I did not realize it until later on that day until i tried to buy something with it. I immediatley went back to them and told them I was told the bill was fake. They refused to give me my money back, called the police on me for being upset and now Im out of $100! Whats crazy is I got a police report but cant do anything with it! SMH