BSNL Cellone, Bangalore — Closed about 6 months ago, why are you still sending the Invoice

Address:

Bangalore, Karnataka

Dear Sir,

About 6 months ago I have closed the BSNL CellOne, Bangalore, Account No.:[protected].

The details are as below mentioned: but I am surprised to receive the invoice .

Mobile Number : [protected]
Account No.:[protected]
Bill No. & Date :[protected]/05/2014
Payment Due Date : 22/05/2014Billing Period : 01/04/2014 to 30/04/2014