EXTREMELY DISSAPOINTED

I am extremely disappointed with FNB. I called in at about 10 am on the 10 June 2019 the gold card division debits section and spoke to Charity after having been on hold for about 30 mins. I expressed to her my concern about an authorised debit of R4500 with ref loan which was done on 6th June 2019. I told her even though the cheque shows as being deposited I never withdrew that money why was it deducted leaving my account on minus R3900. She made me hold another 20 min while she went to go query with her "manager" Mualra who then told her I must go query with the branch where the cheque was deposited. I demanded to speak to the manager and asked her what's the use of online banking if im gona be send to a branch where I did not even go and deposit or with draw that cash. She then said in managing my expectations that she will call me again in 2hrs time and she never. Now the next day on the 11th I called and finally spoke to Keegan after holding on for 41 minutes who answered "gold card division" I asked if Maulra was available and he said he can see she is free he tried putting me on a call and after he said I should hold on. I held on and waited for another 40 min and that is when I realised she does not want to talk to me even though she had said she is going to call. Now all in all I am frustrated as my work production has dropped significantly due to an unauthorised debit that I did not approve and FNB is not doing anything about while I am sitting on a -R3900 account and when you ask questions as to who deducted the FNB staff will tell you they are not allowed to disclose. So they have all these bogus accounts deducting money from your account and yet being the banking institution that is supposed to regulate these deductions they are not. REF no RB ********** 5381 and you get told wait for 5-7 working days while your salary day is getting closer and then unauthorised money gets deducted.