SDCL § 54-3A-20: Debt forfeited for excessive charges--Costs and attorney fees.

If any amount in excess of the charges permitted by this chapter is contracted for or received, or if any other provision of this chapter is violated, other than as a result of an unintentional or bona fide error of computation, the consumer shall not be liable for any part of the principal, interest or any other charges whatsoever, and shall be allowed to recover costs and reasonable attorney's fees.