Citibank — Credit Card Fraud Billing

I used their credit card for quite some time and I felt their ethics was not good and hence closed the card completely last August. I paid for everything! But to my shock, I keep getting messages from them saying I need to pay 1.63Rs! I just wanted to know how can someone pay something for the account which is closed?

To add up, worst ever is my CIBIL score is down 85 points because of not paying 1.67Rs? What nonsense and I'm completely fed up with Citibank. Becoz of such a worst experience before, I closed my account with them But again the same even after closing the account. This is not at all fair!