Broken New Car

<p>November 2014 I bought a Toyota professional 4 months later the car broke and Toyota had the engin repaired under warranty.In the 7th of July 2016 my car broke for a second time just to hear that it's the same problem that we had in March.Our car has been at the repair center for 3 weeks now and still it's not done.Apparently they are awaiting the part.Now my question is why do they not replace the complete engin why repair again after repairs has not been done correct the first time.</p>