If the director believes that any person engaged in the insurance business is engaging in this state in any method of competition or in any act or practice in the conduct of such business which is not defined in this chapter, but that such method of competition is unfair or that such act or practice is unfair or deceptive and that a proceeding by him in respect thereto would be in the public interest, he shall, after a hearing of which notice of the hearing and of the charges against him are given such person, make a written report of his findings of fact relative to such charges and serve a copy thereof upon such person and any intervener at the hearing.