Calling them a scam casino is uncalled for and frankly, no basis. You even said it yourself, it is just an "accusation".
Also, did you participate in that said contest? 'Cause if you did, your reason for throwing out accusations can't be 100% valid as you have a clear motive to taint this casino's name and rep; You're butthurt salty that you did not win the contest.
You pointed out their mistake, and they fixed it, and even goes to an extent of clarifying their mistake, yet you're still not moving on. 
Regardless of that, this matter should have already been closed as a new winner was already announced and rewarded (too bad it isn't you though).