Airtel — want to disconnect my number

Address:

411036

I am not using my Airtel number ‘[protected]’ since two month but still I am getting the bill of the same.
I keep getting call from collection team and then I paid my outstanding bill asked by the team. But still my number is not getting disconnected.
Kindly disconnect my number as I am no more using that number.
I called them everyday but it seems they don’t want to disconnect it...I am not in the country to take any kind of follow up.