Hollywoodbets - *****ulent activity bonus bets

I earned quite a large amount of bonus funds via promotion offers whereby Hollywoodbets add a certain amount to a player's account in the form of bonus credits when depositing. I noticed that the bonus was in fact allocated to my account as per promotional offer with all deposits and these were noted on my account statement/transaction list. However, every time I won and requested a withdrawal, all the bonus credits earned were gone! This surely cannot be common practice? The bonus credits was earned by making deposits. How can these credits be reversed upon withdrawal of winnings from the deposits?

The next concern I have also relates to bonus credits which cannot be used to play slots but only on sports betting. I placed bets on horseracing worth hundreds for which I received valid tickets. When checking my bets, it shows in my transaction query as Paid whenever I won a bet but the payment was never truly added as cash winnings which should increase my fund credit value. I contacted customer service more than once to query this and everytime I am told that the matter will be escalated to the relevant department for further investigation. I never got a reply on any of these queries. I see this as *****ulent activity and unfair practice....