SAA Please Reply To My Inquiry

I've waited for 60 minutes on an automated voice system on the telephone to SAA, to find out what changes have been imposed on our local flights booked in March 2020, but valid for the end of April 2020. No human eventually takes ones call. I have an electronic booking reference L8####. When I follow the email link in the email I've received that says changes apply that I must re-approve, I get to a screen asking for the reference number and our surname. When I enter the information, there's an error message onscreen that says I must put the accurate reference number in. I'm putting in what I've got as my reference number on my initial confirmation of booking. How can I approve changes I can't see? What's going on? SAA neither answers the telephone, nor does their website work, and nor do their email links work. How is a paid up traveller expected to confirm arrangements with so many barriers put up by SAA?