The telecom department has slapped a Rs 48,000-crore demand notice on Oil India (OIL) in past statutory dues, an order which OIL plans to challenge at the Telecom Disputes Settlement and Appellate Tribunal (TDSAT). Following a SC ruling that non-telecom revenues should be included for considering payments of government dues, the telecom department has asked OIL to pay Rs 48,000 crore.