Im being billed for a item I deleted within the 3 day cancellation terms

See the following from Delete apps on your iPhone, iPad, and iPod touch - Apple Support

• If you delete an app, it doesn’t cancel in-app subscriptions that you might have. While deleting an app, you might see a Cancel Subscriptions option. Learn how to cancel your subscriptions.

If you were already billed you will either have to update your payment method and make the payment or contact Apple Support. There is a Get Support link at the top right of this page.