Phone is dead will not take a charge or turn on
my phone went completely dead will not respond to charge will not turn on
iPhone XS Max, iOS 14
Question marked as
Top-ranking reply
How to fix your frozen phone:
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
If that process fails to revive it then either get it fixed or replaced,
How to arrange a service or repair
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article.
If not covered by warranty and you don't have AppleCare+, you may have to pay full replacement cost for severe damage
You can see additional service information within the following article:
Get your iPhone, iPad, or iPod touch ready for service - Apple Support