I need a refund from my Apple Music since I’m no longer using it

If you’re not using it you need to cancel the subscription or it will keep charging you each month,

• To manage subscriptions and turn off Automatic Renewals, follow the instructions here:

View, change, or cancel your subscriptions - Apple Support

Click here and ask the iTunes Store staff for a refund.

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If you hadn’t cancelled it in time before next billing cycle you would be charged. It should take effect on the next one and the charges will cease.