I have a app that i deleted and I’m still getting charged for it

See : How to cancel a subscription from Apple - Apple Support

yarelys224 wrote:

I’m still getting charged for it

Carefully consider what “it” means in your sentence above. It might mean, for example:

• The application. If the application had a price, then deleting that app would not negate that price. You still purchased the app and may re-download it at any time.
• A subscription. Any subscription you purchased related to the app remains active until you cancel the subscription. That is true even if you removed the app.

Yep.

Because you failed to cancel the subscription.

yarelys224 wrote:

How can i cancel the subscription ?

stedman1 answered that for you above.