Any charges, including interest, in excess of the combined total of all charges authorized and permitted by this chapter constitute a violation of chapter 687 governing interest and usury, and the penalties of that chapter apply. In the event of a bona fide error, the licensee shall refund or credit the borrower with the amount of the overcharge immediately but within 20 days after the discovery of such error.
Fla. Stat. § 516.031