How to unsubscribe?

Hello, I have such a question. I am a member of the family and made a trial purchase of the application for 30 days, then it is with a paid subscription, the payment was made from the main card in the family. A notification is now coming that I should pay for this application itself, although I have canceled my subscription a long time ago. The person on whom the payment card is attached is afraid to put money on the card and that it can be automatically withdrawn. Also, in the settings, I read that within 180 days the sub-mail will automatically go away. Generally help please)