You can delete your account and everything in it at any time.
Deleting your account does not cancel your subscription. Cancel it where you bought it: in the App Store, in Google Play, or — if you subscribed on the web — from Settings, then Account, then Manage subscription. Otherwise you will keep being charged.
No longer have the app or your phone? Write to info@venzato.com from the address on the account and we will delete it for you.