The commissioner may after a hearing suspend or revoke the certificate of authority of any mortgage guaranty insurer which, after 10 days written notice from the commissioner requiring it to cease and desist, continues to pay any commission or to make any unlawful rebate in willful violation of the provisions of this article (commencing with Section 12640.12). The hearings of the commissioner shall be conducted in accordance with the Administrative Procedure Act, Chapter 5, Part 1, Division 3, Title 2 of the Government Code, and the commissioner shall have all the powers granted therein.