When I was fitting composite doors this was fairly common. We had a remedial guy that went around sorting it out and he had a kit that had loads of different coloured blocks that you melt into the chip, then sand it down and polish and it's pretty much invisible after that. They will probably have something similar and offer you a small refund as well, but you're well within your right to expect a full replacement.
Jesus what must the rest of your house look like if you're fussing over a tiny mark along the top edge of your door? A black marker and you'd never even spot it.
Your house as a whole when built would have been less than perfect then.
Well given it's a cosmetic touch up a black marker is perfectly adequate, nothing DIY about it, the structural integrity of the door was never in question.
For a start I wouldn't expect a new car, or even a new door panel. I'd expect a repair that I cannot see and some goodwill for the inconvenience.