Goldrush online

I cashed out R900 yesterday from goldrush 1Voucher.I did received the voucher pin.When I entered the voucher pin it said the voucher has been redeemed.Wich i never redeemed the voucher.It seemed neither goldrush or 1 Voucher can assist me to get my R900 back.Al they say its been escalated.They can't even tell me when the voucher was redeemed.Goldrush send me to 1 Voucher and back