They damage our property and don't care

I took my car to Dada Motors Mafikeng on Dec for an aircorn pump fitting and a fan belt. My car is in a good condition and well taken care of. When I went to fetch the car I found my windscreen with a massive crack from one end to the next. I was so shocked that I was not even informed I discovered this obvious near shatter crack by my self. Now what is more disturbing is that the inspection of the car is made in the absence of the owner and we are made to sign black concent forms with the little car scratches not marked at all. The reason given was that the clients are often in a hurry to leave the dealership whenever they bring their cars in for repairs. I had at no stage hinted I was in a hurry that day. Another shocking explanation why my windscreen was near shatter was that the car was left in the sun for a long period and possibly had an invisible crack and got bigger due to the sun rays. They said that my case is not unique since there had been many similar cases before at the same dealership. The officials deemed this normal and insisted that I accept my car in a condition I had not left it in. This was not the first negative incident with this establisegment. I had my car towed to them by my insurance and clearly requested that the car should not be diagnosed. DADA MOTORS simply ignored this directive and refused to release the car until I had to pay diagnosis fee which I said should not be done. I believe this establishment has different approaches to different clients although they do not make their criterion public. The frustrating part is that the dealership is the only one within reasonable proximity. These people do not value all clients let alone treat us the same. I had since been told that I would be called with explanation.