I should correct myself, I bought mine on the online web application/portal. Not the mobile app. At midnight they had the 75% off deals and I think they allocated a certain number of deals at each saving bracket, so as time progressed the deals changed. Mine is 30GB anytime data as well.
Lucky enough to get the 30GB at R 231pm x 24 months (75% off) just after midnight. You needed to either go onto the app and choose Buy Bundles -> Black Friday Specials OR dial *111#. I’m an existing contract customer