I will submit a complaint at Casino Guru too.
Unfortunately, Casino Guru doesn't take care of the sports betting related complaints.
True, its looks like they give up to handle any dispute between sports betting user's and the casino because most of the cases in the past coming from abuser (late betting, fixed match, arbitrage betting, blacklist user, etc).
And they will suggest you to reach askgambler.
But maybe they will take care of that if the OP able to provide them with a solid information and data.
Sadly, you are right. I see now that CasinoGuru has rejected my complaint cause it's sports related.
But I did send AskGamblers an email to ask to re-open my complaint. I find it shocking that they just swallow the words of BC.game as truth and immediately closed the complaint and didn't give me a chance to counter. I have so much more to say about this and I hope they give me the chance.