new Nissan X-trail T32 problems

I purchased a new 2015 Nissan X-trial 1.6 dCi SE 4x4 Tech. after a couple of days took vehicle on highway for first time and realized it was bouncing and vibrating, clutch and gear lever didn't feel right. a week and a half after getting the car the motor suddenly started making a loud pinging rattling noise, reported it immediately. More than 4 months later, at least 1000km of driving my car around and me not having my car for about one month total, Nissan SA technician told me there's nothing wrong with my X-trail. My X-trail feels, handles and sounds nothing like the demo model I took for a test drive. Nissan SA did however find damage to front left suspension which they have very conveniently put the blame on me hitting a pot hole. warranty doesn't cover it so has to be repaired at my own expense, FAT CHANCE, strange thing is it didn't have a steering problem until it came back from dealer who done wheel alignment adjustment. Nissan SA is fully aware of the problems I have reported but nothing has been sorted out yet. Nissan seem the only people who cannot hear and feel what my car is doing. Customer Care doesn't even answer my e-mails anymore. this is my first and last Nissan.