I wouldn't believe a word the SABC says regarding TV licences (especially on their web site), they've got a vested interest in milking you for every cent, and no ethics compelling them to follow the law. The BS on their website is their manipulation of the law, and won't hold up in court, if you've got the energy to fight them.
They won't take you to court if you send them an affidavit telling them that the TV no longer has a tuner, because you'll win, and that'll create a legal precedent that'll cramp their extortion racket, but sure as hell, they'll set their lawyers onto you to try scare you into paying.
Just do what's easiest; send them an affidavit, telling them that the TV died, and you chucked it. They'll demand all sorts of letters and so on, and even if you send them all that, they'll still send lawyers after you, because they're a bunch of corrupt, incompetent thieves. The law doesn't require anything close to what they demand from you, so they'll never win.
I just buy using a family members TV licence (we must have 20 TVs on that licence

). SABC can get ****ed.