The license collector shall have exclusive authority in all such cities to issue all licenses and receipts for license taxes, except water, dramshop and boat or wharf licenses; he shall have authority to revoke any license by him granted, if the person to whom the license has been issued shall have been convicted of the violation of any law or ordinance relative to such licenses. It shall be his duty to prevent any persons carrying on any business, object or calling for which a license or license tax is required, without having a license or license receipt for that purpose; and he shall report to the court hearing municipal ordinance violations of such city all violations of law and ordinances relating to licenses and license taxes. No commissions or fees shall be paid or allowed for the license collector, or any state or city officer for the collection of any licenses or license tax to which sections 82.310 to 82.410 apply. No duties imposed under this section or designated for the license collector’s office by the city shall be altered by any means other than legislative action. Any employees transferred from the license collector’s office due to a change in such duties by a means other than legislative action shall be transferred back to the license collector’s office to the positions previously held, even where such duties were changed within fifteen months prior to August 28, 1990.