Disappointed by the bank that I trusted

The amount of R11700 was deposited into my account on the 12/11/24 from an ATM at Masingita mall by my brother and the receipt was not printed out, I did not receive the money into my account. He then went to the branch immediately to enquire about it which they told him to wait for 4 working days for the money to be cleared as they can see the transaction and they also gave him the ATM number as the reference and a customer service number to call on Friday, on the 14th of the same month my aunt went with my brother to the same branch to get clarity as it did not make sense to her on how does that happen. They were told the same thing of waiting another 4 working days which was until the 18th. On Friday the 15th he called the customer service which also confirmed to him that they see the transaction and he later received and sms stating the approval of the query and money will be paid within 2 working days. On Saturday the 16th I only received R6800 from the R11700 that was deposited and when I contacted Nedbank the consultant told me that their investigations shows that R6800 was found after the ATM was balanced. I then contacted Nedbank again via Facebook and was advised to go to send and email which I decided to go to the branch at Mall of Africa. Theyvalso told me to send email which I did and their response was for me to wait for 21 days as they conduct their investigations but I need my money. This has inconvenience me a lot because I couldn't do things that I have planned to do. I am sitting here with the concern that will I get my money or not. How can Nedbank refund me 6800 when they have received 11700 and also have the audacity of saying it was a failed transaction since the branch was under construction. Why was client made aware that they should not use the ATMs as they are moving and now I should suffer? 😡😡😡💔💔💔💔I am considering closing the account after this so called investigations.