A. Upon any complaint in writing under oath being made by any person, or by the Commission of its own motion, setting forth any act or thing done or omitted to be done by any person in violation, or claimed violation, of any provision of law, or of any order or rule of the Commission, the Commission shall enter same upon its docket and shall immediately serve a copy thereof upon each defendant together with a notice directed to each defendant requiring that the matter complained of be answered, in writing, within ten (10) days of the date of service of such notice, provided that the Commission may, in its discretion, require particular cases to be answered within a shorter time, and the Commission may, for good cause shown, extend the time in which an answer may be filed. Upon the filing of the answer herein provided for, the Commission shall set a time and place for the hearing, and notice of the time and place of the hearing shall be served not less than ten (10) days before the time set therefor, unless the Commission shall find that public necessity requires the hearing at an earlier date.