I understand the complaint. Its costly, its a luxury service, and it was misrepresented. Order the gold Rolex, received a silver one. I'd email the business with a concise, brief statement asking for the partial refund because they did not fulfill their confirmation to you (verbal or otherwise). You can hint that it would be a shame to have to pursue the charge-back with Amex and disclose the details on social media. End with, "please follow up by XX October". Can't hurt. Then throw it into Amex's court if they don't act... might work. Don't mention the model year of the car... in the end, the vehicle represented was not the one sent and that's the fact.