If you have purchased an item but didn't receive it in your game, you can first try to fully close the app and open it again. If it's still not added to your game, please contact customer support and send us the receipt of your purchase order.
For Android players, make sure the receipt contains your order number. If you want to know how to find your purchase orders, please visit the following link.

Google Play: https://support.google.com/googleplay/answer/2850369?hl=en
Apple Store: https://support.apple.com/en-us/HT204088