Damaged my car and after a month still no feedback

We as a department within my company have been using SU parking. On the 30th of October 2015 when I received my car back at the airport I noticed that they broke my handle which adjust my drivers seat back rest. I contacted the guy at dispatch and logged a complaint. They said they will check the cameras at their premises to see what happened. They said that the owner will come back to me and sort everything out. It is more than a month now, I called them several times, and still I cant get hold of this illusive owner. In addition, my colleague also had a incident with them. They scratch his brand new car (which he had for 2 days). To date, he also have not received any feedback from them. My other colleagues also have been complaining with regards to general service. This is unacceptable and I am so frustrated, therefore, as last resort I am logging my complaint here.