This is an accepted solution.
Ivy here from Shopify.
Being charged after the 14 day free trial period is expected behaviour if the store has not been cancelled before the 14th day. However, if you cancel your subscription now, a full refund of the subscription fee can be applied no problem.
While we’re not able to provide account-specific support via the Shopify Community at this time, we’d be happy to complete the refund request through live chat, email, or callback. Please visit our support portal here, and log in to your account to create a support request.
Since this is the next step I've marked this reply as the solution for the benefit of others who may discover this topic. Thanks!