Cancel unknown subscription

Where are you seeing this subscription exactly then?

If you are just getting an email or message, it may be a scam.

If you see "apple.com/bill" on your payment method's statement, it may not be for a subscription, but just a one time purchase. Click the following link to identify the charge.

click here ➜ If you see 'apple.com/bill' on your billing statement - Apple Support

Cancel it via Settings>[your name]>Subscriptions

If it’s not showing in your subscriptions, it’s not through Apple.

you will have to go to the services website and cancel through them.