Here in the US we can go to a local parts store and get a "head gasket leak kit". It's a small plastic tube with some chemical. Put the tube over the coolant fill, start car, rev a couple times. If the chemical in the tube changes color, the head gasket is blown as the chemical detects combustion gasses. You may have something similar where you are and you'd know right away.
At the very least, Nissan should have made your car payments for you while they had the car, and given you a free car to drive.
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