The commissioner may, at any time after a hearing of which not less than twenty (20) days' written notice has been given to the insurer, withdraw approval of any such form if it contains a provision for benefits that is misleading, deceptive or that would encourage misrepresentation of the policy, or if, after consideration of all relevant factors, the commissioner finds that the benefits provided by the policy are unreasonable in relation to the premium charged. It is unlawful for the insurer to issue the form or use it in connection with any policy after the effective date of the withdrawal of approval. A notice of any hearing called under §56-26-102, this section and §§56-26-104 —56-26-105 shall specify the matters to be considered at the hearing, and any decision affirming disapproval or directing withdrawal of approval under §56-26-102, this section and §§56-26-104 —56-26-105 shall be in writing and shall specify the reasons for the decision.