Re: The lock in Question
"My experiences with MS phone support have almost exclusively been transferred to the far east. Namely: every single time I want to exercise downgrade rights. That's two hours per bloody key, every time."
That's NOT professional support. That's license admin.
Professional support is accessible here if you don't have a subscription / other support options:
https://support.microsoft.com/en-gb/gp/offerprophone?wa=wsignin1.0
In many Microsoft support calls over a number of years I have never had anyone who didn't speak English fluently.