Why is my account being charged for something I canceled ? Because it not letting me download anything

In addition to deleting the app, you need to cancel its subscription too, using these instructions:--> If you want to cancel a subscription from Apple.

If you have no active subscriptions, I suggest that you contact iTunes Store Support Team directly, using this specific link:--> Apple Support (if you get no help, look at the bottom of the specific link, where you can contact them using "chat" or "phone" options).

Regards

Giulio