Caribbean Sun Bonus

[Bonafone]

I deposited $150 to clear their monthly bonus for the first time this month and after the deposit it said I had $50 dollars that I could not withdrawal. I figured this was just the monthly bonus but I played about 400 hands and checked the cashier and they gave me $40 dollars and I still have $50 dollars that I cannot withdrawal. I'm wondering what bonus I received and how many more hands I'm going to have to play to clear this last $50.

Thanks