Standard Bank's "moving backwards"

For weeks I have been trying to get someone to assist with a duplicate debit from my account on 29 November 2017. I have dealt with the "Disputes and Charge Back" department - who said the amount has been credited but, guess what, it hasn't. I have also dealt with an assortment of "customer service" individuals including Limpho and Edna. On Monday supervisor Rene promised she would call me on Tuesday (yesterday) which turned out to be a false promise. Even my business banker Rachel Zikalala can't get anyone to respond to her. Would anyone who cares about Standard Bank's reputation please act to avoid losing a client.