FlySafair's R11 sale fail

I had a flight booked for the 7th of May 2025 from Durban to Johannesburg. This happened to be the same day of FlySafair's R11 sale. Upon booking the tickets, I specifically chose the more expensive option that allows for 2 free changes to your booking. The day of my flight, there was a change I wanted to make to my booking, so I went onto their website only to find that it has been made completely unusable except for the R11 flight deals. I logged onto the app to make the change to my booking, but I was only redirected to the unusable website. I decided to send a WhatsApp to the number given on my booking confirmation but was unable to reach an agent. As a last resort I tried calling FlySafair only to be met with a 35min wait whereafter the line went dead. Now, FlySafair, please tell me how exactly did you expect paying customers to make changes to their bookings on the day of your ridiculous sale? Or were you just expecting to collect more money for last-minute changes to bookings at airports across South Africa because we have been denied access to your website? How can a sale justify shutting down your entire website? I am beyond infuriated and utterly disappointed in FlySafair's lack of proper customer service.