Airtel — excess billing and no response to the correspondence on airtel page of face book till now

Address:	Rangareddy, Andhra Pradesh, 500060
Website:	Airtel

I have lodged a complaint in this forum on 23 nov 2017 regarding excess billing on [protected] (Post paid connection) and also lodged with the nodal officer. [protected]@in. Airtel.com.
Instead of resolving the grievance, airtel is demanding payment immediately and i am receiving daily calls.
I am having the correspondence made with airtel since 04 october 2017 which was forwarded to nodal officer today in pdf format.
I was using only whatsapp at all places wherever wifi is available n have not accepted any incoming calls nor made any outgoing calls. I have switched off the mobile data / cellular data through out my abroad trip. Yet i was charged with abnormal amount and was receiving calls for payment daily.

Trust airtel will wake up n delete the unnecessary / disputable charges levied and regenerate new bill so that i can dispense off with this post paid connection, which is nothing but robbing the customers
Regards
Anjani kumar
[protected]