The Department may, upon its own motion or upon the complaint in writing of any person setting forth facts which if proved would constitute grounds for refusal to issue or renew a license or suspension or revocation of a license under this Act, investigate the actions of any applicant or any person or persons applying for, holding, or claiming to hold a license.
     The Department, before refusing to issue or renew or before suspending or revoking a license shall set a date for a hearing thereon. At least 10 days prior to the date set for the hearing, the Department shall notify in writing the applicant for or holder of a license of the date, time, and place of the hearing. Written notice may be served by personal service or by mailing the same by registered or certified mail. The Director may, after a hearing, issue an order to either issue, renew, suspend, or revoke the license.