No response after 5 days waiting

I recieved any instant money transfer of R1500 on the 22 of July and this transaction wasnt sucessful. At the ATM i was prompted to put in my pin and voucher number and after pressing proceed the machine just goes back to the main screen and no slip was printed out, i tried many times and same problem occured. I then went to spar and they told me that the voucher has already been used. After contacting Standard Bank, i was told they will investigate the matter within 48hrs and since now no response from them. I keep calling even emailing but nothing. I even tried posting on Facebook page and they keep saying their team will get back to me. Right now i dont know what to do anymore. My voucher number is ***, and my cellphone number is ***. My support ticket is 698272. I pray that you respond and improve your services. Im still waiting for any answer. Are you really any organisation we should trust with our money. This is the number which standard bank used to sms the voucher +***.