Bad customer service

The air bag light of my VW polo had gone on and I had made an appointment at McCarthy VW Parow to have it seen to on the 24/03/2015. After a few weeks the part had been ordered and my car went in only to discover they had ordered the wrong part. After a long wait my car finally went in again on the 26/05/2015. Once I received my car I discovered the central locking was now damaged, I immediately phoned the service advisor and my car went in the next day again. The service advisor then said that a part would have to be ordered and that they would make it urgent and it would be in by Monday/ Tuesday (1/06/2015 or 02/06/2015). I received a call Monday 01/06/2015 asking how the service was regarding the airbag light, and was a bit confused as the problem was not resolved as the central locking was damaged when they were fixing the air bag. I had phoned numerous time to McCarthy Parow and was promised a call Friday 05/06/2015 between 10