When you cancel your Premium Account after an automatic renewal, you are still expected to pay the subscription costs for this new billing cycle.
During every new billing cycle, you're receiving all the perks of a Premium Account.
You are still expected to pay the costs that come with that.
Where can you cancel your subscription?
You can cancel your subscription at any time on the 'My Premium Account' page, but you must do so yourself.
When you cancel, you'll get a confirmation email.
Of course, after you've canceled, you can still use the Premium Account's services until the last day of the current billing cycle.