Re: How do you cancel a subscription if the system won't accept the cancellation request?
Wondering where the subscription button you tried clicking is located ... in the Monitor's app ... on your Apple Subscription list : View your purchase history for the App Store and other Apple media services - Apple Support
You might want to check just who you are paying for the subscription via your bank or credit card statement.
Perhaps you downloaded the app from the Internet: Eg: https://support.blinkforhome.com/en_GB/subscriptions
(The "Blink" webpage has contact options):
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If you pay Apple for the subscription:
Apple Support's online article may be helpful: If you want to cancel a subscription from Apple - Apple Support
or
Cancelling subscriptions is slightly different in some countries:
About canceling subscriptions in Germany, Israel, South Africa, or Türkiye - Apple Support
For more support from Apple if needed:
There is a "Get Support" link at the bottom of the Billing website (link below)
Subscriptions and Billing - Official Apple Support
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Maybe the subscription was an in-app purchase ? ie: you subscribed in a downloaded app:
The best source of help for a product not made by Apple (a third-party product) is the company or person who made it—its vendor or developer:
How to: Contact a third-party vendor - Apple Support
or
How to contact an app developer - Apple Support