How to block a lost ICICI Bank credit card immediately?

I lost my ICICI Bank credit card. What is the fastest way to block it through the app or customer care to prevent misuse?

I had the same dilemma. The way I decided was: list down my top 3 monthly spend categories, calculate the rewards on each card, and pick whichever gives the highest cashback on MY pattern. Generic 'best card' lists are useless for personal decisions.