Hmm, so it's mainly about the fact that after some small win you can't win anything in this casino anymore, yes?
It's not pleasant I understand, but casinos always have an advantage over the player who eventually loses his deposits. The winner is always the one who has no money to gamble with.
Providing some pictures or knowing that you're going to lose is probably not enough proof and casinos don't have much ability to edit RTP on slots, because it would be impossible to do so.
So even though I sympathize with you and your situation, if you feel like you can't win, the best thing to do is to give yourself a try or not play at all.
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