An administrative hearing shall be available to an employer that reports directly to the system when there is disagreement over the assessment of penalties, interest, or both, pursuant to this article. A written request for an administrative hearing and the reasons therefore must be received by the System at its headquarters within 90 days of the mailing of written notice of such penalties, interest, or both. If no request for an administrative hearing is made within the time prescribed, the penalties, interest, or both assessed shall be final and any right to an administrative hearing or judicial review shall be deemed forfeit and waived.