Hi,
You haven't shared what all things you have tried, so sharing the troubleshooting.
Try the below:
Check if the charger is working on another phone
Try a different charger
Check whether there is any light once you plug the charger, use a side port and confirm if that works
Try safe mode and Factory reset to see if this helps
Update software version to .99 if not already updated
Kindly visit the nearest service center:
https://www.asus.com/in/support/service-center/india