[Resolved]  HDFC Bank — unauthorised transaction on my cc by hdfc life

Hdfc life debited amount for policy premium after the cancellation of the premium. Policy was cancelled on 27th july and amount of 31, 250 was debited on 9th aug. But they say there is no record of transaction however its there in my cc statement.
I was following up since 3 days but so response.
They don't even respond properly.
They are fraudulent transactions without authentication. Where is the security the my account?
Kindly action