Customer support from Nissan SA and dealership have been too slow and defensive

I am not happy with the customer service I am currently receiving from Nissan. I am really disappointed and frustrated with the Nissan 2021 Qashqai I purchased from Nissan Newcastle. Despite being driven for a short period, the vehicle has developed engine problems and the entire engine needs to be replaced in less than 5 years of having this car. The car is still under warranty, I took it in to Newcastle Nissan and the vehicle has been in the workshop for an extended period, and for these two months I have been left without a reliable means of transportation. It is turning out to be one of the most disappointing purchase decisions I’ve made. The customer support from Nissan SA and dealership have been too slow and defensive. For a car I bought at 11000KM this is not what I expected. I feel completely let down and cannot recommend Nissan based on this experience.