Nedbank - Shocking service and harrased by their call center

I need some intervention as I am being harassed by Nedbank’s call center with phone calls and text messages of outstanding amounts on credit cards that I’ve settled in full a while ago. Not only does this stress me out, it is humiliating as the calls I received are during working hours. I sit in an open offices and there is no privacy. 1. I’ve called the call center 2019 to obtain full and final settlement amounts for both credit cards. 2. After 6 calls I eventually got the settlement amounts from Thobeka – I don’t have a surname 3. I then emailed the complaints department, as the service I received and still receiving is shocking. I emailed proof of payment and asked for letters stating that the amounts were settled in full and that both credit cards were closed. This fell on deaf ears. After the 3rd email to the complaints department, I received letters from Olivia with amounts owing. This is not what I asked for and I tried to explain this to her and this fell on deaf ears with super attitude. Both cards were settled a while ago and Nedbank failed to close the account and both accounts are compiling interest and now I am being harassed. 1st card was on R25.87.00 and now with interest close to R100.00 the 2nd card R590.54 and now with interest R944.81 4.I emailed the CEO and Olivia intercepted the email and insists on outstanding amounts thats due and i need to pay it. I went into the Sandton branch to resolve the matter, they refused and said that there is nothing they can help as i need contact the call center. 5.I need this to be resolved by cob on Tuesday 11Feb20 6.Olivia should be taken to task as she has no clue what customer service is all about.s 7.I need an apology and both accounts should be closed immediately and should be compensated for the stress humiliation that is still happening