Airtel — unauthorized account

Address:	North 24 Parganas, West Bengal, 700110
Website:	www.airtel.com

Today I received a message to continue or close airtel payment bank account by sending 'A' and 'D'. But I can't submit 'D' for closing the account.
How could you even dare to open any account without my concern? So, close that account no-[protected] immediately, otherwise I'd rather make complaint to the telecom authorities or ombudsman.