Airtel — deactivate broadband connection

I want to deactivate my connection as soon as possible.
I am trying to reach the customer care call center, airtel thanks app also the web site. But there is no option where i can deactivate my connection.

I also sent them mail multiple times regarding the same but still, no action has been taken from there side.

I am not using this service from the last one month and won't be using it in the future as well

Please help me in deactivating this connection.

Abhishek. [protected]@gmail.com