(1) A supplier shall not deliberately overcharge a customer.
(2) A supplier who contravenes sub-rule (1) commits an offence and is liable on summary conviction to a fine not exceeding 500 penalty units.
(3) Where a supplier overcharges a customer the supplier shall
(a) take immediate steps to correct the bill; and
(b) after correcting the bill, immediately credit the account of the customer with the full amount overcharged and inform the customer accordingly.
(4) A customer is entitled to interest on an overcharged amount at a rate determined by the PURC, if that customer has been overcharged continuously for three months or more.