Do you have proofs? 'coz if your intention is to catch the attention of the ones who organized and started this event, it would be helpful. However, ofcourse it would be better to first try contacting the providers of the contest. And as you have mentioned, you already did. Try a couple of times and if they won't be responsive then they would be subject for scam label. Unfortunately, I am not familiar with this contest. One thing is for sure, if they won't be sending rewards to eligible participants, then that is already an answer. But be sure as well to get things straight specially with the rules and instructions 'coz you might as well have a mistake.