You pay, but not receive help when needed. Microsoft 365

In the past, I paid for a monthly subscription to Microsoft for Microsoft 365. There were issues now and then but they were manageable.

Well, in January 2023, I decided to pay per year. I wish I never had done that.

Recently I needed to change my email address. Only to find out that the program comes in a loop, and I am not able to change anything. The screen freezes.
I do have a key, but clicking on the "login with key" doesn't work.
Because I tried and tried, I am locked out of my account. Without a possibility to get in again.

And guess what!? As is normal with major companies, customer support info isn't to find.
Yes, a telephone number in the USA. Right, not going to pay an enormous amount for a telephone call for support that should be free. By email.

I left a message via Word (not logged on). Makes no sense to do this, there will be no response.

This was weeks ago. My old email address is not accessible anymore. Not possible to receive a code or whatever. The link to log in another way still doesn't work.

And the worst!? I can't even cancel my subscription as you need to be logged on to do this!