The Department may upon its own motion and shall upon the complaint in writing of any person setting forth facts which if proved would constitute grounds under Section 9 investigate the actions of any applicant or any person or persons holding or claiming to hold a license. The Department shall, before refusing to issue or renew, and before revocation of a license, at least 10 days prior to the date set for the hearing, notify in writing the applicant for or holder of a license, hereinafter called the respondent, that a hearing will be held on the date designated to determine whether the respondent is privileged to hold such license. Such written notice may be served by delivery of the same personally to the respondent, or by mailing the same by registered or certified mail to the place of business last theretofore specified by the respondent in the last notification to the Department. The Director, following the hearing, shall issue, renew, refuse to issue or renew, reinstate, or revoke the license.
     The Department, over the signature of the Director is authorized to subpoena and bring before the Department any person or persons in this State and to take testimony either orally or by deposition or by exhibit, with the same fees and mileage and in the same manner as prescribed by law in judicial proceedings in civil cases in circuit courts of this State. The Director may issue subpoenas duces tecum to command the production of any or all records relating to the person.