Citibank — Credit Card in my name which is not owned by me.

This is in regard that i was checking my credit score and details as per that i found that citibank is asking me for payment of credit card which i not use and never used ever with a outstanding amount of 78743/-.
This is impacting my credit score as the card which i held of citibank has been closed and due to unnecessary intrest and penalties i have done settlement for that card. The card no. ending with 1008 i don't even know when they have issued it on my account and i have no details for the same.