Hearing on complaint against official testing station, official mobile testing company, or official portable emissions testing company; suspension or revocation of permit. If it appears to the Department, either through its own investigation or upon charges verified under oath, that any of the provisions of this Chapter or the rules and regulations of the Department are being violated, the Department shall, after notice to the person, firm, or corporation charged with such violation, conduct a hearing. At least 10 days prior to the date of such hearing the Department shall cause to be served upon the person, firm, or corporation charged with such violation, a copy of such charge or charges by registered mail or by the personal service thereof, together with a notice specifying the time and place of such hearing. At the time and place specified in such notice, the person, firm, or corporation charged with such violation shall be given an opportunity to appear in person or by counsel and to be heard by the Secretary of Transportation or an officer or employee of the Department designated in writing by him to conduct such hearing. If it appears from the hearing that such person, firm, or corporation is guilty of the charge preferred against the person, firm, or corporation, the Secretary of Transportation may order the permit suspended or revoked, and the bond forfeited. Any such revocation or suspension shall not be a bar to subsequent arrest and prosecution for violation of this Chapter.