Any party in interest being dissatisfied with an order of the Commission may commence an action in the court of common pleas for Richland County 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. For purposes of jurisdiction the residence of the Commission shall be deemed to be in Richland County.