Honda Cars India Ltd. — servicing of car - bumper damage in workshop

I have purchased new honda jazz cvt (Petrol) car on 29.11.2017 from your dealer deccan honda, pune. I have left my car for first servicing on 15.12.2017 with their driver at 11.30 am. At the time of delivery of my car at 8.30 pm, i found that the rear bumper have scratch & total colour of vehicle was removed at that location. Today i visited to service station regarding this issue & i demanded for the replacement of the part damaged by service station in their work shop. But the service adviser present is refused to replace & told me that he can repair the same at his cost as this is reparable item. But my consent is that why should i accept repairs of my new car purchased only 15 days before. And the most shameful thing is that service manager told me that he can't accept anything and you can do whatever you want.