I deleted an app but it is still charging me money. What should I do ?

If you have an on-going subscription with the app, you also need to cancel the subscription.

Go to Settings > Tap your Name at the top > Subscriptions > select the subscription associated with the app, scroll down to the bottom & cancel the subscription. You can also check this - https://support.apple.com/en-ph/HT202039

If you want to get a refund for the charges, follow the steps here - https://support.apple.com/en-us/HT204084

You have a subscription, it doesn’t matter if you deleted the app.

See this:

https://support.apple.com/en-us/HT202039

You have to cancel the subscription. See or cancel your subscriptions - Apple Support explains how to do that.