Awful service and no communication

One of the worst experiences I’ve had with Audi Center Sandton. My car was due for a service and I booked it in for Thursday before the long weekend. I specifically told them I would be working and to contact my husband for anything and also that he would be fetching my car for me since I would not be able to. They tried calling me once and I did not see my phone since I was working and a few hours later when I saw the missed call, I had my husband contact them back. They told him they needed to order a part for the car and needed us to give the go ahead before they could do so. They then said they would fetch my husband to go and collect the car at 4pm. At 4pm nobody had even contacted him to say they were running late or on the way and my husband had an appointment to get to at 4:30. After many calls and being told that the service agent was busy and she would call back and she never did, I had to take time off from work so that my husband could take me to fetch my car and make it to his appointment in time. I was told that the part for my car was ordered and would arrive on Monday so just to be safe, the car needs to be booked in again on Tuesday. Nobody called me on Monday to confirm anything and I assumed everything was confirmed for Tuesday. The car was taken in today and the service agent said the part didn’t arrive yet and may not even arrive today. I have not hear back from them all day today regarding this, we have tried contacting the center many times and cannot get through. I’m highly disappointed and frustrated as I am going out of town tomorrow and need my car!