Bad service a and overcharging of fees

FNB added charges of over R600 on my account and last month over R300. I've use the FNB app for assistance and got the assistance of a very "cheeky" banker Kgomotso. I've asked her to explain to the charges and fees which she could not just send a screenshot of my transactions that I already have. I've asked to speak to supervisor to assist and things become very ugly and she ended up not assisting and ending the chat. I had to call the customer care number and the matter was still not resolve. I've received and sms whereby they apologize for delayed of processing purchases and any charges will be reverse however no one called me up to today and i had to call and ask for answer which no one could give me. All I got was attitude from their consultants.