If you no longer want to use the service, you'll want to make sure that Auto-Renew is turned off. For this:
Visit socialpoint.io, hover over the Login button in the navigation bar and click Subscription Portal
From the left-hand navigation, click Subscriptions
Find the subscription you wish to upgrade and click the orange Subscription Number
Toggle the Auto-Renew button to OFF
You can also delete your payment information by doing the following:
On your Subscription Portal, click Payment Methods
Click Delete next to your current Payment Method
Note: Your subscription will remain active through the end of your term. At the end of your term, your subscription will expire. You can reactivate your subscription at any time before this expiration date.