I have experienced something like this where I made a deposit of a certain amount, but when the balance came in, it was more than what I deposited. I played until I made a profit and then tried to withdraw it, but there was a problem with the withdrawal, which was always rejected, so I asked the available customer service about it. They responded that my account had received a bonus, so to withdraw all the funds in my casino wallet, I had to make another deposit in the amount specified by the casino.

At first, I followed their instructions and deposited up to $200 in two separate deposits. However, for the third deposit, they required me to deposit another $500. At this point, I became hesitant and asked another friend who had experienced something similar. He told me it was just a trap, so even if I followed the casino's instructions, it wouldn't allow me to withdraw the profits.
At this point, I simply gave up because there was nothing else I could do, and even with the available customer service, they didn't provide a solution. And yes of course I feel cheated.