Customer to buy fridge light while under warranty

I bought a fridge from Hi Fi Corporation Polokwane in March this year. 4 months later the fridge is making a big noise and the light has blown. Service department refuses to fix it even though the fridge is still under warranty. They tell me, as the customer, I must buy my own light and fix it myself. No word has been said about them fixing the noise in the fridge yet. I demand this get sorted out. i will never buy from Hi Fi Corporation again, the service is *******.