If you went to our in-game store and opened the page which allows you to view offers and get coins, then our ads provider, Tapjoy, will be best equipped to provide support for this. You can reach them via the following steps:  

-Open the In-game Store 
-Press the “Get Free Coins!” button in the upper left hand corner of the screen 
-Press the “Missing Coins?” button in the bottom right hand corner of the screen 
-You should be prompted to choose the offer you had trouble with, and seek help for the missing coins.