Zarbet ****

I was playing after a deposit of R250 i started winning up to R1600 and somehow somewhere i apparently clicked on a bus that only gave me R200 i ignored it as i noticed when i play games that was not Zarbet original games it goes away so i did not mind it after winning R5000 i wanted to withdraw and they kept R2500 after i asked what happened to my R1600 before this bonus was active they just said its a casino and thats how it works. This is not the first time btw every-time i want to withdraw after winning big it seems that there is some reason i cant. I would love it if someone can point me in the right direction to expose these people who can i go see how can i report it.