The Department of Telecommunications (DoT) has issued demand-cum-show cause notices worth Rs 294.74 billion to six telecom operators including Bharti Airtel, Vodafone India, Idea Cellular, Tata Teleservices Limited, Reliance Communications and Aircel for under-reporting revenues for four financial years from 2006-07 to 2009-10. The notices have been issued on the basis of a report by the Comptroller and Auditor General of India. The penalty amount includes Rs 64.9 billion as licence fees, Rs 137.51 billion as interest, Rs 31.78 billion as penalty and Rs 60.55 billion as interest on the penalty.