Can not cancel the subscription

The subscription may be one that is not billed through Apple, which is quite likely why there is/was no option to cancel the subscription. If so, see the following:

"Apple doesn't handle billing and membership changes for subscriptions that you purchased outside without using your Apple ID. Steps to change or cancel third-party subscriptions vary based on the app developer. If you want to make changes or cancel third-party subscriptions, you might need to sign in to the company’s website".

Get help with subscriptions not billed through Apple - Apple Support

Ciao Serge,

could you please assist the OP in this thread?

https://discussions.apple.com/thread/250466678

Grazie.

Giulio

Can you please post a screenshot of your subscriptions page?

Насколько я понял, управлять подпиской в этом приложении нужно именно в нем, а не в App Store.

Попробуйте обратиться в поддержку Apple по телефону 8 (800) 555-67-34