When complaint has been made to the commission or by the commission on its own motion concerning any price for a telecommunications service, and the commission has found, upon a hearing after notice given as required by law, that the telecommunications company has    charged for such service a price in excess of the price permitted under section 49-21-01.3, has discriminated unreasonably, or has otherwise violated a statute, rule, or order, the commission may order that the telecommunications company make due refunds or reparations, with interest from a date not earlier than two years from when the complaint was filed.