(a)
(1) No person, firm, or corporation subject to the provisions of this act shall modify, change, cancel, or annul any rate, joint rates, fares, classifications, charges, or rentals except after thirty (30) days' notice to the public and to the municipal council or city commission, as the case may be, depending on the utility affected and the action proposed.
(2) The notice shall plainly state the changes proposed to be made in the schedule then in force and the time when the changed rates, fares, or charges shall go into effect.
(b) The particular regulatory body having jurisdiction of the matter under this act may enter an order prohibiting such a person, firm, or corporation from putting the proposed new rates into effect pending hearing and final decision of the matter by the regulatory body.
(c)
(1) Whenever there is filed with the regulatory body any schedule proposing a change in any rates, charges, or rules, the regulatory body shall have authority, either upon complaint or upon its own initiative, and upon reasonable notice, to enter upon a hearing concerning the propriety of the rate, charge, or rule.
(2) Pending the hearing and the decision thereon, the regulatory body, upon filing of the schedule or after the schedule should be filed, and upon delivering to the carriers or public service corporations affected thereby a statement in writing of its reasons for such a suspension, may suspend the operation of the schedule and defer the use of the rate or charge.
(3) After a full hearing, whether completed before or after the rate, charge, or rule goes into effect, the regulatory body may make such orders in reference to the rate, fare, charge, or rule as shall be deemed proper and just.