On September 22nd I joined Casino Superlines. I deposited 250 EUR and received a bonus. I went on to win 6673 EUR after completing the wagering (this accounts for them subtracting the bonus amount from the balance after I had played since bonus could not be redeemed). I withdraw 5000EUR since according to their terms that was the maximum withdrawal allowed. On the 2nd of October I received 1000 EUR and an email which I attached below. In the email they have said that the maximum amount I could win was 1000 EUR and that the rest of the funds have been voided. I have screenshot all of their general terms and conditions and all of their bonus terms. Nowhere does it say that there is a 1000 EUR win limit. This has obviously been invented by their finance department.
I have attached their bonus terms. At the 8th point it says clearly that I can take 20 times the amount of my deposit in winnings. I deposited 250 EUR. So why are they only agreeing to pay me 3x my deposit in winnings (250 deposit + 750 in winnings)? Is a casino allowed to invent at will how much it pays to their clients?