Apple Music Charged After Cancellation

• You need to  View your purchase history to see your recent purchases and find out exactly what it’s for. If it doesn’t say Apple Music Membership, it was for something else from Apple.

• You might also want to make sure you successfully cancelled Apple Music; if there’s no cancel button and it says expired, then You did. While in subscriptions, see if there’s any apps charging you and cancel any you don’t want:

View, change, or cancel your subscriptions - Apple Support