bad service

my mom bought a car at Pre-owned McCarthy. The hooter was not working, the seat belt for the little one's car seat was too long and not adjustable, the left mirror was shady and not adjustable also. soon as we realised that I called in to report that and I was told to bring in the car. I did so on Monday morning and later I checked with them they said the car was not ready. the following day again I was told that they were still busy with the car. On Wednesday the third day I called in and they said they moved the car from the workshop to Toyota in Gezina and that they have ordered the part and assured me that the car will be ready on Friday. later that Wednesday I went to fetch the car and told them that they will inform me when the part has arrived. only to find that nothing was done on the car and they haven't even touched it. its been two weeks now with no communication. I spoke to the assistant manager and he referred me back to the sales guy.