Instant money voucher already used

Standard bank is by far the sh*ttiest bank I have ever dealt with. 4 days ago, I sent myself R200 instant money through Standard Bank. I got to the ATM to complete the withdrawal, and the ATM showed " The voucher number has already been used" which is impossible.

I sent an email to the customer service department requesting for assistance and instead of forwarding my email to the relevant department, Warren Dix asked me to retype the email and send it to the correct email address, which I did.

Now I get another email asking me to contact *** for assistance and I called the number twice, got put on hold and the line just drops. No one is calling me back with any explanation.