Updating of banking details

Why is it such a mission to change banking details? I have tried doing it online on my profile but it gives a validation error. I enquired at the bank and they said Discovery might not have updated their systems as previously Std bank had a 9 digit account number and now it is 11. I emailed you guys and your response was that I need to do it online, when I rep**** and said I tried that, I received no further response. Reference number received ***. So what's going to happen if you can't collect my premiums at the end of this month?