Kotak Mahindra Bank — kotak bank harassment and fraud claim

In the year 2005 I request for cancellation of my ABN Amro Bank Credit Card, as I was not using that much. There was some amount around Rs. 1300/- which I paid in cash at counter and broke the card and give it to the counter staff and I got my Card Cancellation letter stated that "CARD IS CANCELLED AT THEIR RECORD".
After 11 year some guys from Kotak Mahindra Bank repeatedly ask for the Rs. 5000/-. stating that I have not paid my ABN Amro bank dues.
I have mailed the said letter to "Divya.[protected]@kotak.com" and they said they will check it and try to close the matter.
Now again after 13 years Kotak Mahindra Bank staff called my again and ask for payment, again I said that I have paid all the dues and does not owes any amount, again they ask me to send the same letter to "DIVYA.[protected]@KOTAK.COM".
WHAT THE STUPIDITY IS THIS.
why should I pay them, when I have paid that amount way back in 2005, and this demand is illegal also, how could they ask for money after 13 years.