To cancel autosubscription on macOS please do the following:
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Open iTunes.
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If you’re not signed in, sign in with your Apple ID. If your Mac has Touch ID, you can use it to log in when you're asked for your password.
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From the menu bar at the top of your computer screen or at the top of the iTunes window, choose Account > View My Account.
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Enter your password or use Touch ID, then press the Return or Enter key on your keyboard, or click View Account.
On the Account Information page:
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Scroll to the Settings section.
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To the right of Subscriptions, Click Manage.
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To the right of the subscription you want to manage, click Edit.
If you don't see a subscription but are still being charged, make sure that you're signed in with the correct Apple ID. -
Use the options to manage your subscription. You can choose a different subscription offering, or click Cancel Subscription to cancel your subscription. If you cancel, your subscription will stop at the end of the current billing cycle.
For more details please visit Apple Support page https://support.apple.com/en-us/HT202039