As an alternative to issuing summons and incurring potentially expensive legal fees, you could try reporting the matter to the National Consumer Commission and/or National Consumer Tribunal. I know of at least one case where the National Consumer Tribunal ruled in favour of a consumer and ordered a car dealership to refund her R30,000+ for latent defects that it refused to repair satisfactorily.
Be warned, though: justice is unlikely to be swift (the particular case that I am thinking of took two or three years, if I remember correctly).
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