Updating Bank Details - an impossible task for Sanlam

I have been struggling to update my bank details since 23 March. You would think that this is a very simple request but apparently at Sanlam this is asking the impossible. First I struggled with my section 14 from Momentum which was done on 20 February and only after numerous emails back and forth, the payment was allocated.

Then I needed my bank details updated to make a two pot withdrawal. I sent emails, tried using the Whatsapp service, tried calling the call centre but after holding for 30mins the call drops.

Then on the Whatsapp channel I was first told that my documents was received and the 'back office' will update. After a week of nothing being done, a different agent tells me Sanlam cannot update bank details, my employer has to do it. I don't know how many times I have to explain that I no longer work for the company and I no longer active on their side. But all I am told is they can't do. Really Sanlam? Really?

Eventually I received an email from their complaints department saying I need to send all the proof of what I am complaining about. I sent screenshots and emails and until now, nothing. If I am already struggling with assistance now, what will happen when I am 65 and can eventually withdraw the retirement portion? You'll tell me I don't exist?

What happens when someone leaves a company and that company closes down. Who updates bank details for that client?

Please tell me what the hell I am supposed to do to have my bank details updated? And an urgent response would appreciated.