Partha - maybe this is useful to you. By the way, if I were you, I wouldn't post information about my credit card details on a public forum. Anyone can see it here.
Dear Sir / Madam,
I am writing in reference to my credit card [number here] issued to [name of company here] on [date of issue here].
At the time of writing this credit card has not been used to make any transaction. However, I received a call from the Dehli branch stating that the amount of [***] is due on this card. On asking for detailed information about this figure, I was informed that this figure is for insurance of the credit card.
I had no knowledge about this insurance policy and did not choose to take out any policy with your company. I would like to request that you kindly waive the outstanding charge and cancel the credit card.