In case of a vacancy in the office of the director of the department of commerce and insurance or in case of the absence or inability or suspension of the director, the service upon the deputy appointed under the provisions of section 374.080 shall be valid and sufficient for the purpose of section 375.906; provided, further, that in the absence or inability of both the director and deputy or in case of a vacancy in both of the offices, service upon the chief clerk, appointed under the provisions of section 374.130, shall be valid and sufficient for the purpose of section 375.906.