Sorry to hear that. Google articles and videos for failed updates; there's a plethora of potential solutions out there every time there's a windows upgrade. If you cannot get it "unstuck" then you might have to install 11 from scratch. A word of caution...upgrades can work great on older hardware, if they install properly, and seemingly use magic for older drivers whereas a fresh install can sometimes cause issues because you won't be able to get up to date drivers specifically for the new version because hardware oem's sunsetted their hardware. I imagine windows is simply utilizing the old drivers where it can or perhaps a compatibility mode.
This happened to me when 10 was new. I upgraded a notebook from an older version and it was running okay but I decided to do a fresh install. Lo and behold I could not find windows 10 drivers for ethernet, bluetooth, touchpad, etc-. So, I reinstalled the old windows then upgraded to 10 and everything was fine. WTH microsoft??? I like that microsoft makes it easy on users to upgrade but if they can get an upgrade working fine but not a new install then F them. It's that sort of behavior that keeps my opinion of microsoft low while I have much better experiences with apples. It is what it is. Microsoft has never been known for having the best experiences but in fairness they have to support everything under the sun from lenovo, dell, and Fred's Computer World.