Drilled Holes without concent

<p>I decided i needed a tonneau cover for the back. I called the Broadacres Fitment Centre and arranged the cover to be installed. I specifically asked for the clipped cover. I dropped the vehicle off and when I collected, they had put on an elastic tonneau cover. On top of this, to get the eyelets in for the elastic cover, they drilled 14 holes around the body work, on the side of the bin. When i told them that they installed the wrong cover, all they did was apologies and offer that i could pay in the difference to install the clipped cover. Now i have  holes, on the bodywork of my brand new vehicle...</p> <p>I dont know what to do, they are not taking responsibility for this and are saying that it was a miscommunication and they are not liable... </p>