(a) When a customer's meter or remote read device has been found to be fast or slow, as a result of a meter test made by or on behalf of the utility and at the request of the customer, an adjustment shall be made to the customer's bill.
(b) If the meter or remote read device is found to be a fast meter, the utility shall refund to the customer an amount equal to no less than the charges billed for the excess gas over the previous 24 months of billing.
(c) If the meter or remote read device is found to be a slow meter, the utility shall bill the customer for no more than the unbilled gas supplied during the previous 6 months.
(d) If the meter or remote read device is found to not be registering usage, the utility shall bill the customer for no more than the gas it determines the customer used during the previous 6 months. Determination of gas used shall be based upon information recorded by the meter prior or subsequent to the period of non-registration and on any other pertinent information supplied by the customer or known to the utility.
(e) If a meter is determined to have been assigned to the wrong customer and the customer has been billed based on usage recorded on a meter connected to residential or commercial space not occupied by the customer, the utility shall correct the billing to the affected customers as follows:
(1) For customers who have been underbilled, invoices for the billing difference shall cover the customer's period of occupancy or 6 months, whichever is shorter; and
(2) For customers who have been overbilled, refunds of the billing difference shall cover the period of occupancy or 24 months, whichever is shorter.