Complaint Review: Hidden Brains

The Hidden Brains team are just a bunch of liars. At first I contacted them and explained my concept and idea to them. And they said they could do it and come up with results better than my expectations. So I proceeded and submitted the feature listing for my project. After that, the communication started to fade off. They started replying me after several hours and days even after sending repeated emails and skype messages. I still waited for them to reply. And now there's no sign of their existence. My biggest concern now is what if they've stolen my concept and idea?