Connection not disconnected

Location/place: Delhi

Name of company/service: Bharti Airtel

Hello
I was using Airtel no. 9810661228 and due to wrong charges by Airtel I decided to disconnect connection but even after writing so many mails Airtel is not disconnecting the same.
I have written mails 10 times to Airtel regarding same.
I request please disconnect the connection and close the matter.