No refunds must be made except for solid waste collection or systems benefit charges billed and collected as part of the tax bill or for mistakes in computation of charges due. A property owner must pay the property tax bill, which includes solid waste collection and/or systems benefit charges, in full, for the period billed. Refunds of solid waste collection and/or systems benefit charges must not be made, except upon application of the property owner, where the property is to be unoccupied for at least 60 consecutive days and no solid waste is generated from the property during that period, and the property owner has notified the county in writing 7 days before the absence. The notice must be made a part of a request for a refund of solid waste collection service or system benefits charges and must indicate the dates for which solid waste collection or base or incremental solid waste management services are not required. Refunds must not be made for shorter periods or without prior notice. Refunds must be prorated. (1981 L.M.C., ch. 37, § 1; 1992 L.M.C., ch. 39, § 1.)