The notice of cancellation must state or be accompanied by either a statement of the reason for cancellation, or a statement that upon written request of the named insured, the insurer will specify in writing the reason for cancellation. The written request must be mailed or delivered to the insurer at least ten days prior to the effective date of cancellation or if cancellation occurs pursuant to section 26.1-39-14, within ten days from the effective date of cancellation. The insurer shall mail or deliver the reason to the named insured within ten days after receipt of the written request.