Vodafone India — Demanding money for closed connection

Address:

Chennai, Tamil Nadu, 600122

Hi,

I used is postpaid [protected] and cancel the Connection on September with full Settlement on Vodafone Store.But after month I got bills for pending amount . However I have paid all outstanding on closing time . When I checked with Customer care, they said, its closed on sep and no outstanding and Dont consider that billing mails .
But Dec, I got a Legal notice from Vodafone . This is very shocking .

This is not expected from Vodafone . Needs to resolve !