No Customer service experience whatsoever! !

I have been copying [Email Removed] while addressing a complaint with the branch manager as I am getting no feedback as I also requested to speak to a business manager for months now and no response. Mabongi is the worst manager to deal with and she have no customer service experience. I was then asked again by the 2 people noted above to resend my complaint through which I did and no feedback have been received from last week. There was money that is owed to my mother and was not calculated properly the first time and we went to fnb and Mabongi said she will sort it out and all she is saying now it will take 40 working days which is ridiculous and why we have to wait so long when it was a fault on their side not been able to do simple maths!! I ask again if I can get a call from the business manager asap.... U do not want to speak to Mabongi because she said she will handle this matter with urgency 40 working days does not sound like urgency!!! I am tired of keep explaining to everyone and nothing is been done.