Shocking service at Land Rover Sandton

My Discovery recently went in for repairs at Sandton Land Rover. Apart from diabolical service, and three appointments later, I received my vehicle back with black finger marks on the roof lining and a huge scratch on the back roof window of which I am 100% sure was not there when they received my vehicle. It took another appointment to remove the black finger marks, but they refused to repair the damage they have caused, claiming that I cannot proof that the damage was caused by them. They have, however, offered to pay my excess should I wish to repair the damage through my insurance. They call this 'an act of goodwill'. However, it is not difficult to see that it is anything BUT an act of goodwill. It is much cheaper for Sandton Land Rover to pay my excess than it is to fix the damage. They are therefore acting in their own interest, and their own interest alone.My discomfort with the treatment I received at Sandton Land Rover is three-tiered: 1. They are questioning MY integrity by saying I cannot proof that the damage was caused by them. 2. They are avoiding responsibility for the damages by expecting me to have it fixed through my insurance, which will no doubt cause an increase in my monthly premiums. 3 They are insulting my intelligence by claiming their willingness to pay for my excess is an act of goodwill. I am highly disappointed with their inferior service, lack of responsibility and down right rude and condescending behaviour and I will do everything in my power to avoid this dealership for as long as I drive a Land Rover.