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shall, within 90 days after non-compliance and at least 7 days prior to the date of the hearing, give the person so accused notice in writing of the charge against him or her, and on the date designated shall conduct a hearing upon this matter. The lapse of such 90 day period shall not preclude the Department from conducting revocation proceedings at a later date if necessary. Any hearing held under this Section shall be conducted by the Director of Revenue or by any officer or employee of the Department designated, in writing, by the Director of Revenue. Upon the hearing of any such proceeding, the Director of Revenue, or any officer or employee of the Department designated, in writing, by the Director of Revenue, may administer oaths and the Department may procure by its subpoena the attendance of witnesses and, by its subpoena duces tecum, the production of relevant books and papers. Any circuit court, upon application either of the accused or of the Department, may, by order duly entered, require the attendance of witnesses and the production of relevant books and papers, before the Department in any hearing relating to the revocation of certificates of registration. Upon refusal or neglect to obey the order of the court, the court may compel obedience thereof by proceedings for contempt. The Department may, by application to any circuit court, obtain an injunction restraining any person who engages in the business of selling tangible personal property at retail in SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468