How long have you been using the site for?
I played around on their site a couple of weeks ago and found that the site lacked professionalism and development. I thought they were still in beta and hadn't actually launched yet. Now I can't even seem to open the site as it doesn't connect to the server.
I guess the only thing you can do is wait for BitGrants to respond to you here and clarify what went wrong.
They did'n respond and support email is down too. They take my coin and ran away. I was luky, i repeat: i lost only 0.015