Most likely you have received your upgrade but you cannot see it for some reason. This can often be resolved by Restoring your Purchases. Simply go to the game, make your way to the title screen, go to Options and then go to Restore Purchase. You can also choose to Restore Purchases by clicking Play and then going to the Upgrade or Buy Gold options. If that doesn't work, your payment may still be processing or there is another issue. Here is how to contact Apple, GooglePlay, Facebook or Amazon regarding in-app purchases: