My brand new iQOO Neo 9 Pro is draining battery a lot, I have barley used it after initial setup and charging it, my software was updated to the latest, maybe I should not have done that... It started at 100% and now it is at 55%. I did not fast charge and turned off all things which would drain my battery. I also noticed if I have AoD on, my battery drains quite fast. 
Even my screen refresh rate is set at 60.
But I did not feel that much heat normally, but did a lot when It was charging. It was normal charge, I did not turn on fast chargining coz it was off by default.

Also the most 'System Home Screen' used the most battery, 

What should I do?
Don't think I will get a refund, should I exchange it with a new phone?