Vodafone India — bill received after payment

Address:

Kolkata, West Bengal, 700050

Sir, i am doing this complaint on behalf of my wife, moulika banerjee. She had a vodafone postpaid connection ([protected]). On february we put our request to vodafone to deactivate the service and also we paid all the remaining dues. After some days vodafone customer care also confirmed the same and noted the deactivation request. Now despite all the procedure is over i got a new bill from vodafone on 11/03/2018. I immediately called vodafone service centre, and they told me they updated the deactivation request on their system on 2nd march while i gave my deactivation request on 20th february 2018. This is very unfair and illegal also. Why i have to pay for the fault originating from their ends? Please help me. I attached the 1) last bill i received from vodafone, 2) the copy of the filled up request for deactivation form, 3) the full paid bill thanking you