Review Releasing vehicle back to client with faulty brakes

The Picanto was booked into Kia Pinetown with defective and faulty brakes complaint. Brakes was "fixed" according to the workshop staff and the vehicle released back to the customer as "safe to use". A day or two later the brakes failed again, this time in early morning traffic. Vehicle booked back in again and this time the master cylinder was replaced at huge cost.
A formal letter of complaint was submitted to the workshop manager with questions requiring answers for clarification. A week later, no reply. A formal request was submitted to Kia head office Complaints Department to contact the customer in order to discuss the matter at senior level, guess what...No reply!!. I wonder if going the newspaper route will have any positive reaction from Kia??.