Hank here from Shopify.
Once a store is closed, the subscription would also stop. However, if you had any third-party apps, this could have been final or due charges if the invoice had been generated.
I'd like to take a closer look at this for you, however, as this is account specific, I will just need to verify your account. I will send you an email to the email address attached to this forum's account and confirm some security questions about your store. Once you reply to that email, I will look into this further for you.
All the best,