The parties may, by mutual agreement, withdraw the request for arbitration on a form prescribed by the dispute forum for that purpose. Such form must be signed by the parties and served on the dispute forum. If requested by the parties, their agreement to withdraw may be incorporated in an arbitration award. Additionally, the health insurer may unilaterally withdraw a request for arbitration by serving such request for withdrawal on the dispute forum and serving a copy to the other party. Where the request for arbitration has been withdrawn, fees paid to the dispute forum shall not be refundable, except as provided in section 325-6.10(b) of this Subpart. No request for arbitration may be unilaterally withdrawn unless the withdrawing party has reimbursed the other party for any non-refundable fee which such other party has paid to the dispute forum.