Cancel subscription problem: there is no "cancel subscription" button or option

See the following from How to cancel a subscription from Apple - Apple Support

If you don’t see Cancel, the subscription is already canceled and won't renew.

and

If you cancel a paid subscription, you can keep using the subscription until the next billing date.

Also, a subscription that is already cancelled will typically have wording in fine print similar to "Expires on [date]" rather than "Renews on [date].”

Yes I have.

I just tried it again now by clicking the Get Support button at the top right of the screen and then typing "billing issue" into the Tell us what's happening box. 2 minute wait time at the bottom of the next screen.

This is primarily a user-to-user support forum; other Apple users like you. Contact Apple -- there is a Get Support link at the top right of this page.