Very disappointing service

I bought a brand new 2015 hyundai ix 35, on day1 it had problems with the breaks, followed by the gear box ( & i had to hire a car for 3 wewks ), then oil filter leak subsequent to service , causing damage to the engine & currently having an oxygen sensor light that keeps popping up 2 or 3 days after it has been "fixed" & hyundai management has not taken any action despite reporting these problems to them.... i have lost confidence in Hyundai.