The Commonwealth, any party in interest, or any party aggrieved by any final finding, decision settling the substantive law, order, or judgment of the Commission shall have, of right, an appeal to the Supreme Court irrespective of the amount involved; provided, however, that the petition for such appeal shall be filed with the Clerk of the Supreme Court within 120 days from the final judgment or finding of the State Corporation Commission; and provided further that an appeal bond is filed pursuant to § 8.01-676.1. No other court of the Commonwealth shall have jurisdiction to review, reverse, correct, or annul any action of the Commission or to enjoin or restrain it in the performance of its official duties; provided, however, that the writs of mandamus and prohibition shall lie from the Supreme Court to the Commission. The Commission shall, whenever an appeal is taken therefrom, file in the record of the case a statement of the reasons upon which the action appealed from was based.