Should any customer dispute the amount of any bill relating to a customer account for any reason, the customer may request an appeal hearing in writing and delivered to the district by close of business the day before the first scheduled shut-off date, typically 35 to 55 days after the due date. Such written request shall set forth the reasons for the dispute. The customer must pay any undisputed balances. Upon the expiration of this period for contesting a bill without the district having received any written request as provided by this section, the customer account shall be deemed final and accurate. [Res. 677 § 14, 2011.]