Any retail buyer having reason to believe that sections 53C.01 to 53C.14 relating to the buyer’s retail installment contract has been violated may file with the commissioner a written complaint setting forth the details of such alleged violation and the commissioner, upon receipt of such complaint, may inspect the pertinent books, records, letters and contracts of the licensee, assignee of the licensee or retail seller, and of the retail seller involved, relating to such specific written complaint.