This sounds like a high roller that's disappointed with the changes in bonuses and perks of high level accounts. There is no real case here. You can't just impose what you want and call them a scam when it's not given to you. Promotions vary from one casino to another and it's within their right to change it from time to time. Just leave that casino if you're not satisfied and just play again when they offer more attractive campaigns.
Leave and also advise everyone
Also, all new players
Understand the nature of the work of this quorum site
And to understand how they treat players
And that their admin is very bad and disrespectful
Everyone must understand this, especially new players. I advise them to stay away from this bad site
Perhaps you should take your advice to stay away from this casino as a warning.
I think you just came across a technique that gambling sites constantly use. This is a constant desire to change the rules for calculating bonuses, constant new promotions and offers, and similar methods of retaining and attracting customers. Some sites do this more often than others. But they all do. Apparently you got to a site where it happens all of a sudden and a lot of things change at once.
But it should be borne in mind that the casino usually does not violate the general rules so that you can argue with them through the courts. The nuances are necessarily reflected in the general rules, which no one actually reads. Because it is such a long and boring text written by lawyers.
But in any case, everyone who read your first post will be more careful about this casino.
And it's worth saying thanks to OP for the warning.