No cancel subscription button

I’m having this problem with a few apps where there is so cancel subscription button. I had forgotten that I signed up to a free trial and now I was charge. I don’t mind but I just don’t want to be charged again. I pressed the unsubscribe button on the app and it said I had but it is still Listed in my subscriptions. But when I click on the app there is no unsubscribe button. It is like this on a different app two and I don’t want be be charged again because it is quite expensive. How do I stop it