Defective Fortuner

I purchased a new Toyota Fortuner at imperial Toyota Kempton Park in December 2014.<br> It was discovered that the vehicle had a severe vibration when traveling under loaded conditions(within limits).<br> Toyota attempted to locate the fault by trial and error, this resulted in the prop shaft and carrier bearing being changed.<br> This did not resolve the issue, and was referred to Toyota SA.<br> They tested the vehicle and admitted there was a problem, then returned it, then took it back for tests, and returned it.<br> In all that time there was no communication on what the problem, tests, or repairs were effected on the vehicle.<br> I was then told the vehicle was now to standard as they adjusted it.<br> The problem still persists according to my knowledge.<br> Why do I have to pay for a brand new vehicle and accept a product that is repaired to standard( which it's not)?<br> Toyota hasn't made any attempt to ensure that their customer was satisfied to a reasonable level and asks that I just accept the product, or if unhappy contact the Ombudsman.<br> They have made a point of telling me there will be no compensation for any inconvenience in anyway.<br> There are other Fortuners with the same fault after I reported it.