First time playing w...

First time playing won on free spins and couldn't withdraw they required a deposit of R350 which I did then tried withdrawing R5000/ of Balance of R30000/ accepted withdrawal a few minutes later declined says I gave a wrong bank account number, which is not true, they somehow added another digit to my account number, for them to rectify my account number I must deposit another R1500/00 is this a ****, kindly assist