A purchase was made without my permission

App Store
If you did not make the purchase and you want to cancel it and receive a refund, please contact the App Store support team. You will need to fill out a form to return the purchase. This is the official user website:
https://support.apple.com/en-us/HT204084 
If you want to protect your account from future accidental purchases, see "Protection against accidental purchases".

Google Play
If you did not make the purchase and you wish to cancel it and receive a refund, please contact the Google Play support team. You will need to fill out a form to return the purchase:
https://support.google.com/googleplay/answer/2479637?hl=en-GB
If you want to protect your account from future accidental purchases, see "Protection against accidental purchases".