A utility may not serve any notice of termination if a dispute, informal complaint or formal complaint has been filed with the Commission and is unresolved if the subject matter of the dispute, informal complaint or formal complaint forms the grounds for the proposed termination. A notice of termination mailed or delivered in violation of this section is void. Pending resolution of a dispute, the utility is entitled to bill for and collect the undisputed portion of its utility bills.
52 Pa. Code § 55.110