Hi Sumitchhabra, that's sad! are you using any screen protector that maybe causing the issue? Have you tried again by removing it? We request you to please visit the given link follow the instructions and check if it helps to resolve the fingerprint issue.
Open the Samsung Members app and Click on Support > Phone Diagnostics and run the Diagnostics for the Finger Print Recognition. See if you get any error messages.
You can try Booting into Recovery Wiping Cache partition. If you wipe your cache partition, basically it removes any temporary files that may be causing some problems or issues with your device, all of your personal files and/or settings will not be affected when you wipe cache partition.
1. Hold the Power button and Volume Down to open the power options where choose the Power off. 2. When the screen goes dark press the Volume Up and Power keys together. 3. Let go of all held buttons when you see the Recovery mode on the screen. 4. Then you should select Wipe cache partition. Use Volume Up to navigate and the Power button to accept it. 5. Choose Yes and press the Power key to confirm that operation. 6. After that select Reboot system now with the Power key."
