I want to renew/cancel my membership
If you purchased your Premium+ membership through your iOS device, your membership is managed via your Apple iTunes account. Unfortunately, RSVP’s Support Team does not have permission to help you cancel, manage, update or refund your membership on your iOS device.
Luckily, you have complete control of your membership via the ‘Settings’ on your iOS device. For full details on how to renew or cancel your membership, simply follow the instructions on Apple Support’s Managing Your Subscriptions page. (link https://support.apple.com/en-au/HT202039)
If you choose to cancel your Premium+ membership, it will continue until the end of your current billing cycle. Neither RSVP nor Apple is able to immediately end the subscription prior to the end of your billing cycle.
If you have more questions about your Premium+ membership purchased through your iOS device, you can contact Apple Support. (link https://getsupport.apple.com/GetproductgroupList.action)