The governing authorities of such municipality shall have the power to remove any member of said commission for inefficiency or incompetency or any other cause, but the governing authority of any municipality which has created a commission under the terms of Section 21-27-13, shall not have authority to abolish the commission, or to diminish its powers, except by a vote of a majority of the qualified electors of such municipality at a special election, duly called and held for that purpose. However, nothing herein shall limit, alter, impair or in any way change the procedure prescribed for the sale or lease of a public utility system under Section 21-27-33.