I think we are all in that same boat. Microsoft support has been getting more and more difficult to contact and actually get help from.
All you can do is to try and keep contacting them via the Get Help app in windows (if it is working) or via a web browser at Contact Us - Microsoft Support
I suspect you should wait for a normal week day working period but if you need to go to a repair shop then you will have to follow up a claim yourself.
If you wait a while other users may have an idea on how to fix your computer.
Can you access Safe Mode or carry out a clean boot How to perform a clean boot in Windows - Microsoft Support