Please help me help you change my tax number

I'm having absolutely no luck dealing with Nedbank to rectify my tax number. My tax number changed ages ago, and I notified Nedbank in writing about this. The response was that I need to deal with my branch as I can't be assisted at the customer service level. I got into contact with my personal banker at my local Nedbank branch who advised me that they can't change that information at the branch level and that I need to dial customer services. I found an e-mail address that seems to be related to tax matters somehow (FATCACRSQuerySupport) and sent an annoyed mail there asking for help, but I only got an automated response back and no further feedback.

Could someone at Nedbank please assist me to update the tax reference number you have for me to the correct tax reference number, and re-issue my tax certificate? This is going to cause issues for me on my tax return, AS I TOLD NEDBANK IT WOULD IN WRITING, and I quote " I hereby inform you on record that Nedbank is wilfully choosing to have the incorrect tax number on its system, that this tax number has been deactivated, that I have provided the correct tax number to you, and that your system now has an incorrect deactivated tax number on it that will be rejected by SARS going forward... Should the matter come up in future I will refer Nedbank to this email" to which Nokukhanya Shange rep**** to go to my nearest branch.