The board may, upon its own motion, and shall, upon the verified complaint in writing of any person setting forth facts which, if proven, would constitute a violation of this chapter or rules adopted by the board, investigate the actions of any person holding or claiming to hold a     license. The board shall, before refusing to issue, suspending, revoking, or taking any other licensure action, notify in writing the applicant or holder of the license of any charges made and shall afford the accused person an opportunity to be heard in person or by counsel in reference thereto. The written notice may be served by personal delivery to the accused person, or by registered mail to the place of business specified by the accused person in the person’s last notification to the board. At the time and place fixed in the notice, the board shall proceed to hearing of the charges and both the accused person and the complainant must be accorded ample opportunity to present in person or by counsel such statements, testimony, evidence, and argument as may be pertinent to the charges or to any defense thereto. The board may continue the hearing from time to time.