Rockstar subscriptions automatically renew on either a monthly or yearly basis depending on their type. Cancelling a subscription is easy, simply go to your profile page while logged in, click on "Recurring fees" and select "cancel" from the options column next to your order. This will stop any further charges being made to your card. If you have started a Rockstar subscription via Patreon or PayPal, you need to go into those systems and cancel from there.
If your subscription has been renewed and you didn't want it to but forgot to cancel, please email info@scriptrevolution.com within a few days of the charge and I will action a refund as soon as possible.
If you feel a charge has been made in error, please email info@scriptrevolution.com immediately to discuss the issue and receive a refund if Script Revolution is at fault.