How do I get a refund?
There is a free week trial so you have plenty of time to unsubscribe without paying anything. If you are past the free week, you can possibly get a refund by sending a request to Apple: Request a refund for an App Store or iTunes Store purchase
Note: Apple manages refunds and we don't have control on whether you will get one or not. If you don't do this often and you are within a week or so into your subscription you should have no issues.
Tags: in-app, purchase, refund