I inherited a problem

I bought a 2023 Defender 110 in November 2025 from JLR Bloemfontein. In July 2026 it started leaking oil. I booked it in for checking with a JLR close to me and reported the matter to JLR customer care. After a bit of a fight trying to establish the actual cause of the leak I was eventually told that the car had a replacement of engine, turbo, alternator, intake manifold, engine wiring etc and that was not disclosed at the time of sale. Long story short the retailer is now refusing to take the vehicle back and settle the finance and repay the capital contribution. Customer care is on mute distancing itself from the matter, they can't even take their retailers to account. Now who do we trust when the so called reputable dealerships are letting us down like this?