Florida Pay Day Loan

I have a PDL at a storefront business called Amscot of $500 in Florida. We've been in the horrible cycle of paying it every 2 weeks with the fee of $51 and taking it back out 24 hours later to make sure our bills are covered. We've been in this cycle for 2 years so as not to fault on the loan. I've already made attempts to extend my due date so I can pay it but they will not. My question is if I do a stop payment on the check with my bank what legal actions does the company have against us? Can I call corporate and make payment arrangements and will they keep adding interest?

Thank you for any help!