Airtel
Post paid number close

I used to have airtel post paid connection - 09663394587.

I requested to close this number to the customer care. They don't close it and are continuing it. I have stopped using the number since 3 months. Each month they add monthly rental and send a new bill to me. They are saying for closing the number I need to pay the full amount. I have not used it then why should I pay the full amount.

Kindly help.