When you get someone who hasn't a clue what to do, you normally get a fob off.
I'm just wondering if a repair install would resolve after first uninstalling the update.
A repair install doesn't affect personal stuff or installed programs.
All updates are default installed during a repair install, although you can opt out of them where they will then install as normal after the install.
If you haven't created Win 10 install media, you can after reading the instructions at
https://www.microsoft.com/en-gb/software-download/windows10When you've done that and with the machine started and the install media inserted, open Windows Explorer - This PC and double click on its drive.
This will start the process if using a DVD but will open to its files when using an USB where you would then double click on setup Application.
After the repair install you will end up with a Windows.old folder which contains your previous install.
You can get rid of that with Disk Cleanup by going Start - type disk cleanup and press enter when it comes up.
After the first pass, click on Clean system files where it will find a lot more and give you the option to check the boxes for the update folders.
These will total about 20GB so it may be worth doing a defrag afterwards.