Bad service Nissan

On 16 February 2016 I took my Nissan Navara for its 150 000 km service. The person who assisted me asked if there were any problems that they had to look into. I asked him to pay attention to the front brakes that made a horrible screeching noise when breaking. ( The service I received was very good and professional. The account was very high: R8236.64! ) On arrival back at my house in Kroonstad, I heard the same horrible screeching sound again! I phoned Nissan Welkom and reported that the problem was not solved and was told to bring it in again. He said he was sure that the cleaners who washed the vehicle, forgot to use the high pressure hose to clean the brakepads properly. If I have to take it back to Welkom (64 km`s), who `will pay for the trip and for my time wasted?