INSTANT MONEY SERVICE

I am a standard Bank account holder, on the 01.08.15 i used their instant money service because my sister needed money urgently, i transferred R800.00.She went to Giyani at their ATM she entered the voucher they have sent to her number a couple of times reason being she says while in the midst of entering the voucher the screen would freeze from time to time,she then got a message on the screen that the voucher has been used, but she didn't get the money.I called Standard bank on 03.08.15 Morning at around 8:00 and laid a complaint they gave me a reference 709115 and promised that the issue will be resolved by Wednesday, it is Thursday no response,The reason i used the instant money service was because the need for it was very urgent.My sister need the money for food i don't have any other money to send and they aren't responding, i called them yesterday still the issue is not resolved.