The worst thing that gets me crazy with the casino is, holding my funds and claiming I abuse the bonus system whenever I win a big amount and want to withdraw it, most online casinos have this problem and this is ine of the major reason why some of the onine casinos I call scam.
If you really don't, you can complain to customer service or at the casino's ANN. And if you play at a reputable casino, they will pay attention to your complaint and forward it to the customer complaint department for checking. And if indeed you really do not abuse, they will definitely allow the withdrawal of winnings and apologize to you and maybe they will compensate you as a form of their apology. This is why you should choose a reputable casino so that if you encounter a problem, they will immediately help you and solve it.