Unhappy client

I am client of First National Bank of many years. On the 15th of December I mistakenly transferred money to a wrong account via their app , I immediately went to one of their branches in Westgate Mall Roodepoort to get assistance and they ask to fill in forms for reversal on the following reference number ( *** ) which was to ***. On the 23rd of December 2022 I received an email saying that my complaint was not successful, again I visited the same branch to get clarity why a mistake cannot be rectified. I was referred to the Manager of the branch ( Pontso who was very helpful) ,she escalate the matter to another department and I received the following reference number ( ***7 ) , later in the day I got a from someone who requested the previous reference number and promised to call me back ( 29th December 2022 ) and I am still waiting for that call. On Saturday the 30th of December I called the number that me the previous day, the lady that I spoke to told me that there's no to assist me and I hang up the phone and suddenly another reference number pop up on my FNB app with another reference number ( *** ). Till today I haven't been contacted or get my money. All that I want is my R7500.00 , I had to cancel my trip because I don't have money to use because First National Bank is holding me random since the 15th of December 2022. Please assist me in getting their CEO ( Mr Jacques Celliers to assist because the people that he hired cannot do the work.