Hello my name is Sibongile on the 25th October I won R31,000 on Yesplay united Arizona

Hello my name is Sibongile on the 25th October I won R31,000 on Yesplay united Arizona.I called them and told them that I have won and they told me to FICA I did that,then after they told me to do the withdrawals,I did the withdrawals of R30,000 and it started by pending after 2 days it was approved then after it was rejected by bank. I called them again and they told me my acc is under investigations then later they told me that the is an error I didn't won R31,000 the money that I won is R6,400.i really don't understand because it's not my fault that the was error.when I bet I knew very well that I was playing for R31,000.I have won and I need my money.