(a) Every person operating a public service plant or undertaking wholly or partially in a city for the furnishing of telephone service, water, power, lighterage, wharfage, dockage, storage, heat or light or kindred public service shall serve everybody alike without discrimination, and without denial, except for good and sufficient cause. Every person undertaking to supply this public service shall adopt reasonable rules and regulations for the conduct of the business and the operation of the public service plant. The rules and rates of charges for service shall be given fair and reasonable publicity.
(b) A person operating a public service plant may not furnish the service cheaper than at rates lawfully established by charter, city ordinance, or otherwise, or grant or give a rebate from any sum due, owing, or earned for the service.
(c) A person violating this section is guilty of a misdemeanor, and upon conviction is punishable by a fine of not more than $1000, or by imprisonment for not more than 90 days, or by both.