It is not a straightforward process, you think you have done it but no, one has to scroll down and make yet another click.
TIP
If one does not receive a confirmation eMail that the subscription renewal has been cancelled, you have not stopped Auto-Renewal.
Voice of experience here, but I did get a refund of the full price subscription after talking to one of their reps.
Now the day after I renew I turn off Auto-Renewal, I have a Diary Reminder a couple of days before the subscription ends and check that they have not changed any setting.
Renewed the next day at £89.99 worldwide thanks to the link posted on the forum.
Good luck.