In the event of a dispute between a customer and a public utility respecting a bill, the utility shall immediately make the investigation required by the particular case and report the result of the investigation to the customer in accordance with the provisions of Chapter 56, Subchapter F (relating to disputes; termination disputes; informal and formal complaints).
52 Pa. Code § 65.10
The provisions of this §65.10 issued under the Public Utility Code, 66 Pa.C.S. § § 317, 501, 1301, 1304, 1501, 1502, 1504, 1507, 1508, 1702 and 1704.