The commissioner may at any time, after a hearing conducted in accordance with the provisions of the Kansas administrative procedure act, of which not less than 20 days written notice shall have been given to the insurer, withdraw approval of any such form on any of the grounds stated in this act. It shall be unlawful for the insurer to issue such form or use it in connection with any policy after the effective date of such withdrawal of approval.
K.S.A. 40-445