As others have stated, s75.
https://www.moneysavingexpert.com/re...our-purchases/
When I bought my RS4 there were a number of undisclosed issues which the supplying garage was not interested in at all, I called my card provider and brought a claim under s75. They requested an independent report on the car, which I got. They agreed to settle at the full cost of repairs which amounted to a large sum (thousands), if we hadn't come to an agreement they would have refunded in full and taken the car away!
It was <£30k in my case, sadly I think not going to work in your case as s75a relies on the credit being tied to the item purchased, so car finance would have worked but a credit card probably not?
https://www.moneysavingexpert.com/re...hases/#over30k
I'd still be contacting the supplying dealer to get their views and support, but ultimately you might have to suck it up as any offer you are getting at present is goodwill!?