Board Thread:Game Discussion/@comment-35242994-20180611190757/@comment-28759957-20180612120925

You just have to go to reportaproblem.apple.com, select the item you bought, report a problem, and click on refund. You've 14 days from the purchase date to report the problem without being charged. You'll have a full refund. It happened to me too with another game, you could be lucky and have both the refund and the gold purchased.