how to delete apps with reoccuring charges

View, change, or cancel your subscriptions - https://support.apple.com/HT202039 - "Learn how to view your subscriptions that renew automatically, change your subscription period, and turn off Automatic Renewal." "If you don’t cancel more than 24 hours before your renewal date, your subscription might renew."

This only turns off the autorenewal process. If you must have the entire subscription canceled before the trial period ends you will have to contact Apple: iTunes Support - Use this form for assistance with account and billing, code redemption, or purchase questions - https://ssl.apple.com/emea/support/itunes/contact.html

or Worldwide iTunes support - https://support.apple.com/country-selector/itunes

Then delete the app listed in the subscription list. You must cancel the subscription. Deleting an app alone does not do that.