C250 CDi Break Squealing noise post Service

My C250 cdi was booked in for a service in November 2015, brake pads were changed. Squealing noise started which numerous attempts were unsuccessfully made to find the defect and fix. It was escalated to Service Manager ( Wouter Nienaber / Pauline Bruwer (who took over in 2016), and now I have had to live with this noise for 4 months, and I dont feel that this is being taken seriously. I have an expensive car that I bought brand new, R565 000 and after the 2nd service when the brake pads were changed, it has a embarrassing load squealing noise. This is a safety critical item on the car ( brakes) and no one has written back with the assurance that the layman is rest assured that this company is taking their business and the safety of their customers seriously. <br> <br> I used and exhausted all communication channels ( personally, telephonic through he call centre (the guy who took my call in December actually laughed during the discussion) and email)<br> I am extremely disappointed and frustrated to say the least about this situation.<br> <br>