Orders are always intended to deliver instantly. However, delays are possible whilst the purchase is being processed. Avoid making multiple purchases by not going through the buying options again.
The first thing to do is try to restore your lost purchase by using the 'Restore Purchases' button from the in-game settings menu. If this does not help, please try the advice below.
If you haven’t received a purchase made more than 24 hours ago, please contact iTunes support. All payments made toward the game are processed by Apple. You can reach them right here.
Otherwise, please contact us through the in-game assistance with a screenshot of the purchase receipt you received by mail. To contact us through the in-game assistance, tap on the "Contact Us" button in the top right corner of your screen.