GREE does not store, or have access to any of your credit card information. That’s because the payment transactions themselves are completed through Apple’s App Store or Google Play (depending on your device) via your personal email address associated with that account.
So, for inquiries related to transactions or to report suspected fraud, please contact either Apple or Google directly by following the instructions below:
For Apple (iOS) devices:
Visit Apple support and select the "Contact iTunes store support" link, then "Purchases, billing and redemption" and choose the option that fits you best.
For Google (Android) devices:
Visit Google support and perform a search, or use the ‘Contact us’ button on the page (English language site only) to reach a Google customer support representative by email or by phone.
Please note: A receipt for each transaction is emailed to you by Apple or Google soon after each purchase. However, purchases may be bundled together if you've bought multiple items and might take longer.