Tenaga Nasional Berhad (TNB) has established a One Stop Engagement Centre (OSEC), offering a single point of contact to respond to customer enquiries and feedback on TNB billing and account related matters. Billing and Account related Matters: 1-300-88-5454 TNB Careline 15454 Tenaga Nasional Berhad (TNB) […]
Tenaga Nasional Berhad (TNB)
