Airtel — over charge/inflated bill

Address: Ramagondanahalli, 560066

I have been customer to Airtel since year 2006 with two additional add on numbers ( ref details below). My compliant[protected] is not being addressed by Airtel, but set to close & I have reached out to customer care, billing, appellate, nodal, ombudsperson but with no respite so far. Its been frustrating since Nov’19, that billing team is following up with me for payment of an illegitimate amount of Rs 51, 500 and also threatening to disconnect of the services. They in fact disconnected for about a week in Dec spoiling my year end family vacations. I have always been paying through automated ECS and all bills are paid regularly, untill oct 2019. I never had any due amount pending until this issue came up in Nov 2019. I need your help to clarify me of the details of this inflated, illegitamate amount and there by resolve this issue . Since my ECS has been stopped due to this large amount in Oct, I have made manual payment of oct, nov & dec legitimate usage bills so far.
Pls find reference of all my previous communication below with airtel in trailing emails.
I have attached my previous month bills where my plan and payments paid receipts can be tracked for all these 3 numbers up to date until Sep 2019.
Pls ref attached Aug & Sep bill for payment acknowledgements untill then fyi.wher as Oct bill showing an added ontime bill amont Rs 47910.39 which in Nov they have added a fine as well.