downgrade to microsoft 365 classic

Following a microsoft support page on how to downgrade from 365 basic to 365 classic, I cancelled my 365 subscription. The support page didn't state that the instructions do not work for 3rd-party stores. After chatting to someone at Microsoft Support, he said that because my subscription had been through apple, I would not be able to get 365 classic through microsoft and that I should contact apple who would have the 365 options, including downgrading to classic (which is what I had before I was involuntarily upgraded to basic). My apple subscription page only shows the upgrade and price for 365 basic. I have been unable to contact apple support regarding this issue and cannot find an existing apple support page that would help with this issue. Has anyone else had this issue; if so, do you have a resolution for this problem?