Disgusting service

I am really dissatisfied with the service received from Fnb,from the 15.11.2020 I have been trying to resolve a matter with Fnb,everytime I call I get transferred to a new department who in turn transfers me again,on several occasions my call gets cut off,even to the point that I rated their service on an email that I received. The lady that called me back claimed that the call was handled correctly by the call center,yet the issue of my missing payment of R20 000 has still to date not been resolved!!!! What amazed me was the customer care lady was not really interested in assisting but rather just informing that the call was handled correctly,we eventually reached a point where she asked if she could assist me on my behalf and all she did was transfer me to another department, I have no clue what to do and I have never experienced such bad service!!!!!!!!!