Hello Anil Oza,
Welcome to the Microsoft Community.
I understand that you're experiencing an issue with the Power Adapter not working.
When you connect the power adapter, does the charging indicator light up? If you can access the system, does the battery icon in the lower-right corner of the desktop show that it's charging?
If you have another power adapter, please try connecting it to see if charging works.
Additionally, please check if the methods in the link below can help resolve the issue.
What to do if your Surface power supply or charger doesn’t work - Microsoft Support
To avoid some misunderstandings, please allow me to clarify that as community support, we are not Surface Hardware Support Team. Therefore, we do not have the authority to check exactly what happened in the entire Surface return process.
If the issue is determined to be a hardware problem after following the troubleshooting steps, please request a repair service.
How to get service or repair for Surface - Microsoft Support
I hope this information helps. If you have any updates, feel free to let me know—I’ll be here to help.
Best regards,
Huy-K | Microsoft Community Support Specialist