Board Thread:Game Discussions/@comment-65.182.226.37-20140612184513/@comment-198.160.9.62-20140612213552

You have to click on the ? on the offers page and open a ticket with support in order to get your gems. However, when I did this it was for a paid offer (granted it was only $0.50) and received my gems a few days later after I was able to confirm my purchase. I'm not sure you'll get the same level of support in your case since it's a free offer and it's tough to prove you fulfilled it (maybe with screen shots?).