If any interstate rate, joint rate, fare, toll, charge, rule or regulation, classification or schedule of rates, joint rates, fares or tolls is found to be unjust, unreasonable, excessive, unjustly discriminatory, or unduly preferential, or in violation of, the interstate commerce law, or in conflict with the rules, orders or regulations of a federal agency, the corporation commission may apply by petition or other proper method to the relevant federal agency for relief.