Hi IoannisA,
Thanks for letting us know your user experience.
We understand the frustration caused by the upgrade scheduling. To check the latest status of your Office 365 tenant, could you offer us your Office 365 domain (Example: xxxx.onmicrosoft.com) in the Private Message?
With it, we can check if your Office 365 tenant has been scheduled in the service upgrade tasks.
The tenant would be scheduled anytime. So, we can inform you as soon as it has been scheduled.
To access the Private Message, you can follow the steps below:
1. Please go to the details section on the right side of the community site.
2. Click "Private Messages".
3. Click the subject title of the response to read the message.
Thanks,
Wilfred