Dekra cracked and chipped my windscreen

Dekra sent a driver to collect my car in Franschhoek for the roadworthy test to be done in Paarl. Once driving the car a few days later, I found my windscreen chipped in many places and cracked. I have camera footage showing the driver leaving my home and the windscreen had no chipped places or cracks. I'm a new driver and I hardly drive my car at the moment, so I noticed the damaged windscreen only a few days later. Upon noticing this, I whatsapped the employee who arranged the car to be collected. He said he would speak to the driver. He then spoke to the driver and I was told that the driver was careful and Dekra can't be held liable. I've now emailed them three times requesting camera footage and the time that the driver arrived on site - I still haven't had a reply. This has now become ridiculous. Own up to what occurred instead of making excuses and ignoring the client. This is a terrible customer service.