Chapters 27 through 41 of this Title shall be administered by the South Carolina Employment Security Commission. The Commission shall consist of three members to be elected by the General Assembly, in joint session, for terms of four years and until their successors have been elected and qualified, commencing on the first day of July in each presidential election year. Any vacancy occurring shall be filled by appointment by the Governor for the temporary period until the next session of the General Assembly, whereupon the General Assembly shall elect a commissioner to fill the unexpired term. Each commissioner shall receive an annual salary payable in monthly installments.