Bet big? What is big in your opinion? Your understanding of big might be different from what we and owners of Stake think it is.
If you really see it happening this way, why wouldn't you record your session and put it on youtube? I could be sympathetic if I saw this happen. If you were to bet in a pattern like this ($1 W, $1 W, $10 L, $1 W, $1 W, $10 L, $10 L and so on), people might start to believe you, but for now it's your word against the casino's.
I don't think that it's rigged but if I lost a million dollars I'd probably change my mind. You can go crazy after such loss.
Maybe the OP is gambling with a different game pattern and he has explained that he will always increase the bet every time he loses, if someone had to know how slot casinos work then he would not accuse the casino of being rigged because of the low potential we can win at slot gambling and the solution must be to minimize losses for bets next session. Don't play emotionally to increase your bet every time you lose because you will experience high losses and won't be able to recover your losses if you gamble with that pattern, that's why I rarely play slot gambling because it has an impact on the emotional factor of risking all my funds.