Airtel — prepaid to postpaid conversion gone wrong

Address:

New Delhi, Delhi, 110063

I recently converted my connection from prepaid to postpaid and to my surprise the representative of this esreemed firm just disconnected by original prepaid no. And provided the sim of some other random no. This is so against the rights of consumers and the mental agony i feel to see my number disconnected is immense as all my work is related to it.