It may be more effective to seek assistance from our Billing team for account and billing issues. You can contact them here and then choose 'Account, payments & subscription'. They are the most qualified to assist you in this matter.
Re: Stop charging my account immediately I cancel this in September
@bholloway Login to your Roku account on a phone or computer. Then check your subscriptions. When and if you find your subscription(s) you can cancel there. If your subscription(s) are not listed then they are not though Roku and you will need to cancel from the appropriate provider. Their is no charge for Roku service itself so a broken device will not cancel any subscriptions.