I don't know my secret answer for Student Finance

In the same situation. Recently left my place of work which must have triggered something in SLC. Got a letter saying that I needed to update my details immediately or face "penalties and "charges".

None of the links in this email to change your "secret answer" work, as you need to know what your "secret answer" is in order to be able to get in to CHANGE your "secret answer". It just goes round in circles and then locks you out of your account due to security breaches if you type in the wrong answer.

Maybe it would be a good idea to tell you what the secret QUESTION is in order for us to be able to remember a "secret answer"!! I've resorted to messaging SLC on Facebook, hopefully they will be able to help.
I had almost the same palaver when I changed my address a few years ago.
It's almost as if they don't actually want to help anyone.