Bad service

I took my car into Barloworld Coachworks in Isando on the 15th of December 2015 to replace the bumper on my car. Before booking the car in I phoned them to confirm when the car will be done as my husband had to start working again the 4th of January 2016 and we only have one car and was told that the car will be finished long before that. Needless to say the car was not done and now we have no form of transport. I phoned three times on the 4th of January to try and get answers as to what is happening and only got a reply after the third call and a promise of taking things further if I do not get an answer. In my conversation with Owen i was informed that the last of the parts for my car was received on the 23rd of December which gave them more than enough time to finish painting and assemble before the due date. I was also informed when Owen phoned back that i will only get my car by Friday 8 January, but if the car is finished earlier they will let me know. They had three weeks to replace a bumper and could not finish the job. This is unacceptable and very bad customer service.