Standard bank app took money for electricity but didn't supply voucher

I bought electricity using the Standard Bank app for R500 on the 19th of July.I did not receive a sms to receive my voucher number.I went into the bank the following day at the Somerset West branch.There were only 2 staff members working t there and a que of about 15 people.After waiting half an hour.They gave me a phone and put me through to customer service.I was on hold for an hour then it advised me I am nr 104 in the que.A lady working there told me I must come back the next day.Problem is I can't go into the bank everyday.I have ongoing issues with my internet banking with Standard Bank.I received a reference number *** via email from Leonie Bruyners.Today is 1 week later and I have still not received any feedback from the bank.They took R500 of my money and now they are quiet.Standard Bank service is disgusting.If I could rate you 0 I would because there is no service at all.I expect you to sort this issue out ASAP.I will close my account as it seems like Standard Bank Staff are ***********.I expect a call from you with a voucher number ASAP