Toyota — Innova crysta 2..8 Z

Address:

Mumbai City, Maharashtra, 400080

I had purchased Innova crystal Automatic transmission Z variant on 28/10/20016.
After 4000 kms run I had a tyre burst at a very low speed of 20 kmpl., which I got it changed at my own expense. Luckily no mishaps as it was at a low speed.
Again after a run of 5200 kms on 13/03/2017, on my way from Mumbai to Shirdi I got an alert from the vehicle that engine needs to be stopped immediately which I did and contacted Toyota helpline. They towed the vehicle to Wasan showroom in Nashik.
Next day I was informed that the pipe which carries oil to the gearbox had been damaged and gear oil had leaked.
Now they ask me to bear all the charges for the replacement of the pipe and gear oil
I have also been informed that it will not be covered by insurance.
Also I fail to understand how can the pipe burst spontaneously on its own.
Does Toyota really check the quality of its parts and if the answer is yes how come this leak has happened.
I am can sure it has happened due yo faulty pipe.
This can also mean that due to gear oil leak there might have been damage to the gear box.
I refuse to pay for the faulty pipe and all the further repairs and expect Toyota to do the necessary repairs and replacement at the earliest.
I will consider fighting in the appropriate and judicial manner if need be.