Africa Win Bet Blocks My Withdrawal Until I Deposit 900

I created an account with Africa Win Bet and requested a withdrawal of 10,000 yesterday. When I tried to withdraw this money, the system told me that I must first deposit 900 before I can receive my 10,000. I refused to deposit the 900 because I do not understand why I have to add more money in order to withdraw my own funds. I also tried to find Africa Win Bet customer support to ask about this, but I could not find any contact or support channel anywhere. I kindly request that Africa Win Bet clearly explain why I am being asked to deposit 900 before withdrawing 10,000, and provide full information and clarification about this withdrawal condition so that I can understand whether this is legitimate and how I can safely receive my money.