Any party in interest being dissatisfied with an order of the Commission may commence an action in any court of competent jurisdiction against the Commission and other interested parties as defendants to vacate or set aside, either in whole or in part, any such order on the ground that the order is unlawful or unreasonable. But no cause of action shall accrue to vacate or set aside, either in whole or in part, any order of the Commission, except an order on a rehearing, unless a petition to the Commission for a rehearing has been filed and refused or deemed refused because of the Commission's failure to act thereon within twenty days. Any action brought hereunder must be commenced within thirty days from the date of service of notice of the order of the Commission on a rehearing or of its refusal of a petition for rehearing, either by order or failure to act thereon within twenty days.