Terrible customer service

My car was taken in for repairs a month ago at Renwe-it Sandton. The estimate date I was given was 27 November. I email my customer service person, Cindy, to find out how the repairs are going on Monday 20 November. She said it seems like they will be done the following Monday. On Friday I called again to see if we are on track for Monday, but then I just got a reply saying "We are trying our best to finish the car as soon as possible." I am not happy with this answer, as it doesn't not allow me to plan for transport not know how long it is going to take now. I tried calling customer service this morning 6 times, but each time I got cut off as the receptionist transfer my call. When I finally got hold of someone else, she said the delivery estimate is for 7 Dec, which was a complete different story as to what I was told until a week ago. These people don'y care. My car has been in assembly for a week. How can this take so long? It is not like they are waiting for parts and for paint to dry. I'm really appalled. I don't have rental cover, so it is costing me R1500 in car hire per week.