South Africa Law
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Obviously the easiest think to issue summons and request specific performance in terms of the warranty. However, I think in order to first try and solve it in a way that will satisfy you, you might consider laying a complaint with the Motor Industry Ombudsman. They can be found on www.miosa.co.za
This is s free service and usually is being dealt with swiftly. If the outcome is not what you want then you need to get lawyers involved. This is however a long drawn out process as the dealer without doubt will defend the matter. Purely to protect their reputation and not because they have a case.
Trust this will assist.