When South Central Bell Telephone Company receives an increase in its net return as the result of any order issued by the Alabama Public Service Commission or a contingent increase as the result of a supersedeas order issued by a court of proper jurisdiction, which results in an increase in settlement revenues paid by South Central Bell Telephone Company to any connecting telephone company through any interconnecting agreement or otherwise, the Alabama Public Service Commission will review the financial earnings of each affected connecting company, and if such earnings exceed that authorized by the Public Service Commission and the law, will direct such companies to reduce local exchange rates and charges in such amounts as to comply with authorized earnings; provided, that where the connecting telephone company receives a contingent increase in settlement revenues from South Central Bell Telephone Company as the result of a supersedeas order issued to South Central Bell Telephone Company by the court, such connecting telephone company shall have the right to file a new schedule of rates and charges with the commission recovering any repayment which may be required by it arising out of any judicial modification or vacation of said supersedeas order. This section shall apply to any increase in net return to South Central Bell Telephone Company or its successors or assigns.