A. Billing errors are adjusted subject to the Department's approval. Adjustments are made by way of credit or debit to the customer's account unless another adjustment method, such as a refund, is approved by the Department.

B. Any error or overcharge on a bill must be reported to the Department within 90 days of the billing date. When the overcharge is made because of erroneous information provided by the property owner or tenant, or the Department has not been notified of the error within 90 days of the billing date, the Department may deny the billing adjustment.

C. The maximum adjustment amount is limited to the overcharge accrued in the immediate past 36 months prior to notice to the Department, as reflected in the Department's records. In addition, the Department reserves all defenses, offsets, and claims allowable by contract or in law.

D. The maximum backbill for under-billing a property is limited to the charges accrued in the immediate past 36 months prior to discovery of the under-billing, as reflected in the Department's records. In addition, the Department reserves all defenses, offsets, and claims allowable by contract or in law, including interest.