Instant Money never received due to faulty ATM

I've send R800.00 on 25/03/2015 to my cellphone number ***. I struggled endlessly(after punching in their voucher no). The ATM in Grey Owl Centurion gave us a slip with error code #0047. I've contacted the Instant wallet department who advised me the machine is faulty and advised me to transfer the money back to my cheq acct ***, without success. When I contacted the same department an hour later, they advised me to go to the nearest branch to claim my R800.00 back as the voucher have expired(or redeemed as they put it). I find this very disappointing as there's nothing I did wrong. Why cant they fix THEIR MISTAKE via online or log a complaint for STANDARD BANK to fix it? I work from 08h00-17h00 and cannot get off from work.