Canceled my subscription and it’s charging me again

View, change, or cancel your subscriptions - Apple Support

• If you don’t cancel more than 24 hours before your renewal date, your subscription might renew.
• After you cancel a subscription, the Cancel option is no longer there, and is replaced with re-subscribe options. If you click one of those, then you may have undone the cancelation and continued the subscription. You can cancel once more.

check your purchase history to see exactly what the charges are for. It will say “Apple Music Membership”