If you made a purchase in the app but didn't get your coins to your account please send us an email from Google about this purchase. After you made a purchase the email about this purchase must be in your email or in your wallet (wallet.google.com). There must be a transaction ID like this: GPA.1122-3344-5566-7788. We will check the order status with this transaction ID and return back to you.
To view your purchase history you can here: https://support.apple.com/en-us/HT204088