***** salesman, ensueing problems, 4 weeks later no resolution

I app**** for a credit limit increase on my Gold credit card early July '18. It was approved but the agent told me it was effective 5pm that day and it took 10 days.... Agent also told me I qualify for a Premier card with a lower interest rate than my Gold card. Agent did not tell me Premier is double banking charges to Gold or that most benefits eg airport lounges are only if you have a linked cheque ac, I don't. Am now being debited x 2 in one month for both Gold & Premier & FNB omitted to transfer increased credit limit to Premier, so it shows I have exceeded my funds and FNB trying to debit me for nearly R4k, I'm paying Dr. Order returned charges for FNB's error. I have spoken telephonically with at least 20 different FNB staff over the past 4 weeks, I've never used Premier card, cut it up and asked all I spoke to at FNB to cancel Premier and reinstate Gold. Several staff said they were working on this matter but I have no credit card, although I have credit available, and FNB is still trying every few days to debit my ABSA ac instead of sorting out the matter as I am not behind with installments, FNB just slipped up. I have spent hours of my time and spent a lot in airtime phoning FNB and holding on for sometimes 20 minutes, only to tell the whole long story to an agent who then says she can't assist and cuts me off while transferring my call. Several times a week for the past 4 weeks. Apparently, the latest is that Admin Dept is sorting it out, but this total runaround and inconvenience FNB is putting me through has now made me ill. I am at my wits end. Can't believe FNB has such dishonest salespeople pushing their products, and has this messy internal process of opening cases and complaints where nothing gets done and you have to phone yourself and get put on hold only to have to tell the whole story to someone else. This is 4 weeks later! Please can this be urgently resolved now!