Tata Motors — tata zest brake hub & drum rusted

Address:

600116

I had bought my tata zest xt in 2016. Now since jan 2018, i was having a problem of back wheel getting jammed if i don't drive the car for 2 to 3 days. The vehicle will move only after a thud noise as if some lock is released and then for some km's the wheels will make some noise. I had complained this to tafe service center at greams road but even after multiple services, the problem is not solved. They are saying that the hub and drum are rusted which is true as i saw that last time at the service center, photos enclosed. I am pretty sure that it is because of defective material or else how is it possible that in three years the hub and drum are getting rested. I need the hub and drum of my car to be replaced immediately free of cost.