If you decide to unsubscribe from any Norton subscription, you can do it by disabling automatic renewal in your Norton Account. In addition, you can delete your billing information. This will ensure your credit card does not get charged on the renewal date.
To learn about how to cancel Norton automatic renewal, see this FAQ: How to cancel automatic renewal of Norton products and services.
For editing the billing information in your Norton Account, see this FAQ: Delete credit card info in My Norton Account.
Refunds: In order to see if you qualify for a refund for your Norton software, the best is to contact NortonLifeLock support.