No way to change Pro Tools subscription plan

[kmo19]

As most of you probably know, support though the Avid website has always been, and apparently will always be - atrocious. I simply want to change my Pro Tools subscription from Studio to Artist. How can I do that? There's no option to do this anywhere in the Account section. Any attempt to get "Help" leads one to filling out random forms that have nothing to do with what I need, with Submit buttons that do nothing. "Chat now" takes you to a worthless bot, and no phone option is offered.

I know they do this on purpose to keep people from unsubscribing from their current plan - shame on them for this. But does anyone have any tips for changing a Pro Tools plan tier?