New car faults

I bought a new Ssangyong Korrando and after 4 months of having the car I have to replace brakes,radio and steering rack. No all of a sudden no one is to blame and Ssangyong Mahindra don't even answer their phones. The dealership just pull up their shoulders and say it's a factory fault. So does that mean I must sit with a brand new \second hand car". No one comes back to you"