If you subscribed through your iTunes account follow these instructions (deleting an app won't stop a subscription) : View, change, or cancel your subscriptions - Apple Support
I’m getting charged for hbo and no longer have the app
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If you subscribed through your iTunes account follow these instructions (deleting an app won't stop a subscription) : View, change, or cancel your subscriptions - Apple Support
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How can i stop payment for simple control apps
If you mean stop a subscription then follow the instructions in my previous reply
How can I stop payments for a app I no longer have ?