Just got the tmobile android 12 update on my Oneplus 9pro global version and its causing issues

I didnt even ask for the OS and it downloaded even though i had it blocked...hold thing is broke equalizer is gone, fast charging gone, ask a load of questions all day annoying; drains battery, crazy layout..this was not a ONE Plus Update OS...camera is jacked up now; so is the screen record...going back to the original one...stop forcing upgrades on the sneak...restarted phone after it kept going slow for some reason...now i know why ..trying to install in the background !!!!!