Make sure that you vote using the same Steam account that you connected to your forum account. Have a look at the Voting List - there you can verify the number of your registered votes, and you will receive GC for every vote. Usually it will happen within an hour after you vote, sometimes it can take a little longer.
At the beginning of every month Ghost Coins delivery is delayed, and you should receive GC after a few days. You don't need to worry or report it.