Refund
I was offered a free trial by an app for two weeks and yet I have been charged by Apple.
iPhone SE, iOS 11
Question marked as
Did you cancel during the free trial? All such trials automatically subscribe you if you don't cancel them. If you didn't, you should do so to avoid being charged next time round:
View, change, or cancel your subscriptions - Apple Support
As to a refund, strictly speaking all purchases are final (after all, you can't very well return them): please see this page for information on requesting a refund: Request a refund for an App Store or iTunes Store purchase - Apple Support
Apple do say in that page, 'You can't request refunds for recurring charges': however they have been known to be sympathetic in cases of actual error, so it's possible that they may allow you a refund as a one-off concession: but please be aware that they are under no obligation to do so: go to iTunes Store - Contact Us - Apple Support
Alternatively go to the page suggested in the Help page linked to above: Report a Problem