Subscription Problem - Inability to Update or Download Apps

• You can't delete a Pending charge.
• Any free trial you sign up for will become a subscription if you don't cancel at least a day before that subscription start date as seen on the Approval Screen when starting the free trial.
• Signing up for a free trial/subscription requires double clicking the side button with the terms showing on the screen, followed by Authentication with Face ID or Passcode. If you did not do it, then anyone you allowed to use your Passcode is authorized to use your device and that would include purchases. You would need to be proactive in preventing the person from making a purchase using Screen Time Restrictions or a unique Password for purchases.
• If you are the Organizer of a Family Plan using Purchase Sharing, then members are authorized to use your payment method.
• You won't be able to continue and use the App Store for any reason, including updating apps, until the pending transaction has been resolved.
• You can't request a refund on a Pending transactions, but after it has been allowed to process you can try requesting a refund. In most cases all transactions in the App Store are final due to the explicit actions required for the transaction, but at time Apple may provide a compassionate refund.

Request a refund for apps or content that you bought from Apple - Apple Support