Perhaps you should stop the autobet of martingale or minimize the number set therein for you to have more clarity and some sense of fairness. Stating outrightly that Stake is rigged is unfair and what you can't prove should remain a suspicion. What if that was what was programmed at that time? The fact that it happened to you like that doesn't prove anything. I am sure that if they have anything to hide, they could have let you have some up (win) for a few numbers which will still mean nothing to them because you will lose in the end.

We often suspect where we play our risky activities but in the end, it might not be as we think. After all, we are playing against the more intelligent algorithm that will make sure that the house never loses.