I had a similar thing with Honda Western Edinburgh when I bought my Jazz. They wanted to add so many thing to my car at triple the market prices because they are a dealer and I said no for everything on their second hand Jazz.
In the end, they agreed to change the 12v battery and replace the plastic alloy inserts. The car will be ready in 7 days they said with everything done. I told them I cannot pick it up as I had to go overseas for a month just a day later after their 7 days so they sent it to me a day before my trip.
I was not at home, my partner just got the keys and when I got back from work, merely hours before my flight - no 12v batttery and no alloys inserts. I called from a day later from the airport telling me they couldn't replace because they don't have the parts. OK, some plastics and 12v battery, really? So why did you keep the car for 7 days and I had to spend on the train?
No problem. Paid the whole PCP directly with Honda Financial Services so the selling lady (Emily, thank you) can kiss goodbye to the 1.5k commision she was supposed to get.
2 months later after countless of chasing (I was just pushing my luck) - sorry, what parts are you talking about? Right, no worries. I was just silly to not get everything in writing when I signed the deal but I'm so happy she won 0 from the deal.
Mate, some random indy all-brands dealership, fine, I understand. The official Honda Dealer? Paying a premium over the usual, yes? They deserve to go bust.