If you want to stop your subscription then this is easily done through apple. -
Subscriptions may be managed by the you the user and auto-renewal may be turned off by going to the your account Settings after purchase. Please refer to our pricing page and terms on our App store page regarding this.
Go to the settings page and click on Subscription manage in iTunes.
This will take you to the iTunes store account page where you will be able to cancel your subscription.
Currently we allow you to login and view your data, alongside export a copy of it even if you do not have a subscription. Before you stop your subscription we strongly advise you to export your data as a spreadsheet and report.