Standard bank *********** service again, horrible experience after using the app for convenience to find the greatest inconvenience

Bought prepaid electricity via standard bank app to come find out the voucher pin is invalid after several attempts. After calling in to the banks customer care I was referred to Eskom who then referred me back to standard bank claiming they issued the faulty voucher. I finally went to the shop to buy another voucher to see whether the fault is with Eskom or standard bank to find that the voucher from the shop works 100%. After calling standard bank again I was told there's nothing they can do insisting Eskom is at fault, that's how I lost R400 via the standard bank app. Be careful people