Tata Motors — tata hexa - rust in engine.

I have purchased this vehicle in month of june 2019. Within less than a year it started giving me issues. On the new year eve, when we were on our way for celebrating new year, it was not at all moving beyond speed limit 50km.. Warning symbols were shown in between and when we reached nearest dealership, they were not able to identify the issue. Eventually it got fixed by itself.

Now power steering is not working and reason is that due to the rust in engine, fluid got leaked. At the dealership, they are asking us to pay an amount of 4k to paint the same to avoid rust.

Why would i pay for something which tata should hold responsibility for. Only mistake which i made was that i purchased vehicle from tata motors when there were plenty of other options.

What is the security here? It cost almost 20l for this vehicle and within an year engine is rusted. God knows what all will happen in near future.