Q: How can i refun apple music

You would have to discontinue the automatic payment part of the service

and that would stop it from being active, from within the Apple Music store.

{read through... as I've added content}

The auto-renewal is what you need to address, to discontinue the service.

Try the Edit payment information section in your Apple ID:

Payment methods you can use in the iTunes Store, App Store, and iBooks Store - Apple Support

This seems most likely...

• View, change, or cancel your subscriptions - Apple Support

The actual main page says nothing about how to stop auto-renewal.

https://www.apple.com/music/membership/

And I reported this issue in a 'did this help' form on one of those pages, btw.

Good luck in this matter!