Consumer Redressal

I purchased a Dell Laptop in the month of September and I am continuously facing the problems since September only. This is 4th time my laptop is getting operated. I requested them to exchange my laptop with another piece as this piece is a faulty one but they are not at all doing it. They just replace the faulty part and within next week another part gets faulty. Please help me I really want to change this laptop and want to get another unit of it. This unit is full of faults.