'Instant'Money disappeared!

At the end of August I created an Instant Money withdrawal voucher (reflected on App as 3rd Sep for some reason) using the Standard Bank App on my phone. This used to be so convenient before. When I tried withdrawing the money the ATM notified me that there was a technical problem and I ought to try again later. I did, and it said the voucher was invalid. This had happened once before, but the money had eventually come through after repeated attempts. This time it was not to be, I tried for over a week. The amount is R500. I visited the branch at Wonderpark and they confirmed that R500 had left my account, yet no one knows where it is now as I had been unable to withdraw it. They told me InstantMoney is an independent entity, so they tried calling. InstantMoney phones weren't working. They sent an email (about two weeks ago), I still haven't heard anything. Turns out I'm not the only one. I met someone just as frustrated, particularly because Standard Bank can't do anything about this. Money that I worked hard for and entrusted the bank with is gone! I will never use Instant Money again. It is very unreliable.