In order to investigate this problem further, you will have to share a screenshot of the invoice that was given when you had made your purchase, as well as your Player ID through the in-game support button from settings. As soon as the team receives the details, the team will revert back on the next steps. 

 

Alternatively, if you are looking to get the amount you spent, you would have to raise a request with Google Play-store or App Store (iOS).