Any seller who enters into any contract or agreement which does not comply with the provisions of ORS § 83.010 to 83.190 or who violates any provision of ORS § 83.010 to 83.190 except as a result of an accidental or bona fide error shall be barred from the recovery of any service charge, official fees or any delinquency or collection charge under or in connection with the related retail installment contract or purchases under a retail charge agreement; but the seller may nevertheless recover from the buyer an amount equal to the cash price of the goods or services and the cost to the seller of any insurance included in the transaction. [1963 c.489 § 18]