Yes, you can still be charged for your Sideline subscription after you've closed your account. Closing your account does not cancel your subscription as they are two separate actions.
If you've closed your account but did not cancel your subscription:
To stop future charges, you will need to cancel the subscription through your App Store as Sideline does not have control over your app store subscriptions & purchases.
We recommend doing this before the next billing cycle so you're not charged for the next month.
Questions? submit a request.