Atrocious service from NEDBANK Client Service Manager

I have been trying to sort out my Nedbank accounts from New Zealand for over 6 months now. I first called the branch in Cresta Johannesburg, I got told you must come in to see personal banker. I explained that I was in New Zealand. He simply said that is the way it is. Then I sent a mail to ***. I received a reference number CCM ***0. After a week I sent it again. Then again, and again and again. I got a response from Silindile Mona Ngiba. Client Service Manager. I laid the problem on the Table. a Month went by, so I mailed her direct. One aspect of the problem was resolved, I asked to get the rest sorted. She then disappeared off the radar. I sent multiple mails literally begged her to assist. Today is 17 April 2020 and I am still waiting. I have logged another complaint to whom I am also waiting on a response. What do you do to get HELP? Who do you contact if the channels put there fail and fail all the time? Is it so much to ask for? a mail or just someone that can help. In a big corporate bank like Nedbank seems the clients don't matter. You are just a number in the pool. I am at wits end.