Sometimes, due to network problems, the purchase you made on Facebook for our games may not be delivered normally. When this occurs, the purchase will be delivered as Facebook Credits. Please check your Facebook Credits balance for any missing payments first. If you get the credits, you may simply use them to make purchases for the game again.

To check the Facebook Credit balance, please go to this link:
https://secure.facebook.com/settings?tab=payments&ref=settings_nav

Or go to Setting-Payments-Account Settings to check your Facebook Credit.

You may contact Facebook for a payment issue via:

https://secure.facebook.com/help/contact/146600035918755