Section 12. Any insurer or sponsor or other interested party aggrieved by any order or decision of the commissioner made without a hearing, or the advisory committee on prepaid legal services may, within fifteen days after written notice of the order or decision, make written request to the commissioner for a hearing thereon. The commissioner or his designee shall hear such party or parties within thirty days after receipt of such request and shall give not less than fifteen days’ written notice of the time and place of the hearing. Such hearing shall be an adjudicatory hearing as defined in chapter thirty A. Within thirty days after such hearing, the commissioner or his designee shall affirm, reverse or modify his previous order or decision specifying his reasons therefor in writing. Pending such hearing and decision thereon, the commissioner may suspend or postpone the effective date of his previous order or decision.