WHY IS MY MONEY ADDED AS BONUS??

I Deposited R50 to play megaball and without any notice half my money was taken and added as bonus. And and the other R25 was used as available funds... The only reason i used you guys was because i wanted to try the slots as well, I pinned 10x on habanero - aztlans gold @ 50c per spin = R5. then I went to megaball and placed a R20 bet. Thats it then i was told all my money is gone and in all the statements and betting history only R25 was used... How can you take my money and tell me its a bonus??? I cant use it on the games i play. Instead i have to use it on SOCCOR? ,HORSE RACING? and LUCKY NUMBERS??? how can this be acceptable to anyone. If i wanted to bet on horses i would have but that's not why i deposited anything to you guys, i would have used a sports betting platform that gives bonuses for those type of bets. Now half my money is sitting by you and i have to bet double it in order to use it. Thats straight up theft. making me work for the money i gave you to use on the games i want to. I understand if it was just extra bonus the limited games. but that's my money you telling me is a bonus