Sorry to hear about this.
Run SMMI test to see if its a hardware related issue,
How to Enter SMMI_TEST (test hardware)
Go to Calculator=>type " .12345+= "
you will be entered to SMMI_TEST
If hardware test fails,
Kindly visit the nearest service center:
Find service locations - India | Official Support | ASUS India
If it passes and even though you have tried all the steps I would request you to visit the service center. SMMI test will give you an idea whether its related to hardware or software.