Whirlpool India — defective refrigerator / issue not resolved properly

I bought wirlpool refrigerator in last month, it is single door.
From starting day one i am getting different issues with this product. All time company send a person called technician, he checked something and then told us there is no any problem.
There is problem with transistor (Excess cooling happens in freezer)
But technician decline just by looking fridge from outside.
I am not getting proper service from wirlpool company and not getting replace product though it is under warranty.