My Rog Phone 2 screen goes dark but I can still hear apps running and can interact with screen

My Rog Phone 2 screen automatically goes dark but I can still hear apps running and can interact with screen.iam trying to contact by using twitter insta but no one is responding.i wasted 38k on this phone and in result i got this.atleast give me a proper customer care number.
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Hi, sorry to hear about this.
Kindly visit the nearest service center:
Due to the lockdown, service centers may not be functional. Kindly call the service center before you visit one.
https://www.asus.com/in/support/service-center/india