I want to cancel the app I just installed to stop spam calls I do NOT want to pay charges

Cancelling a subscription or deleting an App does not reverse the transaction made.

Unknown Charge?

1. App Purchase
   1. Curious about a Charge? --> If you see an 'itunes.com/bill' or an unfamiliar charge on your statement
   2. If you have an issue with an app on App Store or billing --> Request a refund for an App Store or iTunes Store
2. Subscriptions
   1. You may view a subscription to an app --> See or cancel your subscriptions - Apple Support
   2. You can also request a refund for a recent renewal of an in-app subscription purchase 

Avoid accidental purchases

1. If it is your device then, please --> Use Guided Access with iPhone, iPad, and iPod touch - Apple ... before handing over a device to a child.
2. If it is your child's device then in the future, enable the Ask to Buy feature --> Request and make purchases with Ask to Buy - Apple Support

It could be Phishing

• Beware of --> Phishing & Other Suspicious Emails 
• Know how to --> Identify legitimate emails from the App Store or iTunes Store 
• Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams —> Use these tips to avoid scams and learn what to do if you think your Apple ID has been compromised.

Delete the app on your iPhone that you do not want. If you are unable to cancel the subscription or in-app purchases, then Please start here 👉 Refunds, Subscriptions & Billing Questions

Axel F.

chicken458 Said:

"I want to cancel the app I just installed to stop spam calls I do NOT want to pay charges: I want to cancel app I just loaded to stop spam calls on iPhone"

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Troubleshooting Scam Messages:

Three Thoughts:

A. Use Malwarebytes Mobile Security:

The free version blocks popups. Read the following post to see how to use this software: Blocked numbers - Apple Community

B. Modify your Credentials:

If you suspect activity issues, and interacted with it an any form, then modify the you credentials:

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

C. Report this to Apple:

Have a Screenshot of this? Forward a screenshot of this as an attachment to Apple using this eMail address: reportphishing@apple.com. In the comments pane, inform Apple of what the attachment is all about: an eMail containing an attachment of a phishing scam. Use my User Tip: Using the Photos App to Report Scams: - User Tips