No respond to the order of the part

Our bakkie was repaired by Brooklyn Motor Lab in end of July 2015 after the car accident and the car was done to collect in September 2015. However, when we collected our car, David, the guy in charged with our car said, the cover for the car under the right front light was mis-ordered by Ford because Ford sent them the cover for the wrong side, so if we can collect the car first then they will inform us to go back to be installed by them later. However, after two months, in early December, I phoned David and he said he would call me back later because they haven't got the part after two months later! But he didn't call me back afterward. We tried to phone them, but most of time no one answered the phone until this afternoon(19th Feb 2016) I phoned them at 3:30, then the receptionist said I shouldn't \Shout to her\" because she couldn't do anything after I complained to her. Then I talked to David again but he **** to me again that he would go to the store to check if the part has arrived and called me back in 5~10 minutes. However, he didn't phone me and I tried to call them at 4pm for more than 10 times, no one answered my call. This is really really unacceptable!"