Google Play

  1. Visit https://pay.google.com/
  2. Tap Activity
  3. Tap the purchase in question
  4. This should open a transaction details screen. Send us TRANSACTION ID unique code.

iOS App Store

https://support.apple.com/en-us/HT204088

  1. Go to reportaproblem.apple.com.
  2. Sign in with your Apple ID and password.
  3. A list of your recent purchases appears.
  4. Share with us screenshot of the purchase, where its name and time & date are visible.