As this is a 6waves games on Facebook, your purchase of game coins are done through Facebook credits. If you have trouble with Facebook credits, like having paid but the credit did not show up, you may try the following steps.
Clear you cache and refresh your browser. Make sure that all your software is up-to-date. The issue may be that the server and your game have not connected properly, and a refresh may work.
If step 1 does not work, try repeating the same steps in 24 hours. Sometimes our back end takes time to update. Usually, purchases are immediate. However, there may be situations where crediting your game currency may take longer.
If neither of these works, you will need to file a ticket with Facebook. Now because we, at 6waves, have no control over the Facebook credit support system, you should contact Facebook about this issue. Please go to http://www.facebook.com/help/contact_us.php?id=137574362977954 to fill out a Facebook support ticket.
Please note that requests for refund of cases which are over 2 months may not be entertained.