So sorry for missing all of these messages!
Firefly - you won't get charged for months you're not using the store. Payment only happens if you actively make a monthly payment. To delete your store, please log in to your account and go to the Store …
So sorry I missed this comment from so far back! This was an issue and was resolved at the time. If you need help in the future, please use the helpdesk: https://indiecart.com/helpdesk/ Thanks!