golden palace casino question

[scorer]

Deposited 100 there for a 300 bonus with an 8000 wr. Playing surrender blackjack, i have played 4 online casino's previous to this one. What in god's name is the deal with them. I started at 400 and am down to 170 betting 5 per hand. This is not a bad run, the dealer can't lose he's getting 19/20/21 all the time. I tried to cash out my original 100 and no can do. Has anybody else cleared this bonus without problems or going broke.