Incompetence Standard Bank Call Centre people who have no interest in solving Clients Questions

As a new Standard Bank business account holder I have been left appalled by the incompetence of their call centre agents.We made a payment on the 27th October 2017 using a suppliers website that charges us in US Dollars,we recieved a notification SMS & it reflected in our bank statement that a payment was made of R21 590.03.Yet when we checked our account on the 30th October 2017 it reflected that R22 273.08 had been payed to the same supplier.When I called the Business Banking call centre agents about what's going on here, they passed me on to international banking agents whom after asking them for answers they gave me a personals direct number who apparently can answer my questions.When I spoke to this personal she said she is not allowed to deal with incoming calls and sent me back to the international banking agents who sent me back to business banking.I had to endure a whole day of wasted time being sent back & forth between business banking agents & international banking call centre agents with neither being able to tell me how a bank can change the amount payed whenever they feel like it.