This is the official Support site for ASUS USA.
Official Support | ASUS GlobalDepending on your region the process may be different, but in this region you can use the Support site to register your serial number and request an RMA. It also has phone contacts if you would prefer to speak to someone over the phone.
The Online RMA FAQ is here:
https://www.asus.com/us/support/article/818If you are unsure of your warranty region, you can PM me your serial number and I'll check the location for you.