c. Except as provided in section 7 of this act, before denying to grant or renew a registration, or suspending or revoking a registration, pursuant to this act, the commissioner shall provide notice of the denial, revocation, or suspension, together with a specification of charges to the applicant or registrant, personally or by certified mail to the address of record, and the notice shall set forth the particular reasons for the denial, suspension, or revocation. The denial, suspension, or revocation shall become effective 30 days after mailing, unless the applicant or registrant, within the 30-day period, meets the requirements of the department or files with the department a written answer to the charges and gives written notice to the department of its desire for a hearing, in which case the denial, suspension, or revocation may be held in abeyance until the hearing has been concluded and a final decision rendered by the commissioner. The commissioner shall afford the applicant or registrant an opportunity for a prompt hearing on the question of the granting, suspension, or revocation of the registration. The procedure governing the hearing shall be in accordance with the rules and regulations of the department. Either party may be represented by counsel of its own choosing, and has the right to subpoena witnesses and to compel their attendance on forms furnished by the department. The commissioner shall render a written decision stating conclusions and reasons therefor.