Your cancelled service should activate to Paypal to cancel your subscription. However you may need to check.
To cancel a server or other service with GNZServers Hosting, it is up to you to cancel any automatic PayPal subscriptions you have in place.
1. Log in to your PayPal account.
2. Click More (on the Menu) -> Settings
3. Navigate to "My preapproved payments" under Financial Information.
4. Find your automatic payment to GNZServers. Click it.
5. Click the 'Cancel Subscription' button at the bottom of the information page.
6. That's it - You're done!