There's no one to complain to. You probably couldn't even pinpoint which exact company and exact person you should file a lawsuit against.
In my case, when I reached 100% certainty that one brand is rogue I wrote a detailed review, warning players to stay away, and with the help of my fellow affiliates I made sure it ranks #1 on Google in the respective market. In fact, I'm #2, just behind the brand itself.
In unlicenced territories, brands have to rely on reputation. So that's your weapon of choice.
However, you'll probably have to lie, since they're probably good towards players and bad towards affiliates. Players wouldn't care if an affiliate got scammed even if they understood affiliation in the first place.
Affiliates won't care about your problems either, and will continue to promote that same sportsbook even if you had 15k stolen.
And will then post a tragic thread about that same brand stealing from them a year or two from now, asking for help.
That's all I know
