SERVICING NOT DONE PROPERLY& BAD CUSTOMER SERVICE

Renault SA has the worst customer service ever, took my car for 30000 KM service on the 28th of January 2015, it was in a perfect drive-able condition when I took it in. Then Renault called to say I must fetch as it was ready to be collected. Renault Durban is like 2 minutes away from my work place, I went in, took my car and went back to work. On my way home I felt there was something wrong with my break pedal, it was getting stuck when I was breaking, Friday I took it in . Explain everything to the foreman & he took my car for a drive, and we came back and he told me my discs needed to be changed and I was given a quotation of how much it will cost me. I Then went back very upset and called their customer care number to explain everything. When I take my car for a service I expect to get it at its best condition so my question to them was why did they not pick up that my discs were warn out, why did there only became warn out after they touched my car because it was fine before I took it in? I then had to wait the whole day to get hold of workshop manager Ian who gave me such a terrible attitude and did not help me at all, INSTEAD he said I should go to motor ombud & complan.