Airtel — airtel not disconnecting my landline and charging me

Address:

560100

I had placed request to airtel customer care on 27th oct for disconnecting my landline, on 29th again i complained, they gave me for number[protected], and confirmed that within 2 days it will get disconnected, after 3 days they told me it will take 15 days after a week they told me it will take 45 days. Meanwhile they sent me bill which included 6 days post my complain date.