Money retracted

I deposited R22k at a Standard Bank ATM on the 27th of February 2023, soon after I inserted the money, the ATM put a display on the screen that "money was being retracted", after that nothing on the screen, no receipt, nothing, it was like I didn't even use the ATM, it literally went back to the initial display when you 1st get to use the ATM. ALL MY MONEY GONE. I called the security guard and he helped writing out the ATM number and advised that I came back the next day. 1st thing in morning I went back to Standard Bank to explain what happened and the consultant assured me that my matter would be resolved in a matter of 24 hours. The following day which was Wednesday I received a message from Standard Bank that my matter had been resolved. To my surprise and disappointment when I went back to the bank on Thursday March 2nd 2023, the consultant told me they only received R15.500 from the R22k I had deposited. I refused to accept that as that's NOT the money I deposited. She then told me that the matter will be further investigated. I am beyond dissatisfied with the service of Standard Bank, it's been a week now and my money has still not been recovered. I need help with recovering ALL the money I had deposited.