Hi all, very useful opinions/feedback which has helped solidify my way forward. I’ve spoken to Motability this afternoon too and as you all suggested there is no pressure to accept the car and they will assist with the cancellation process and any dealership issues should I need it. For now they just want me to start an official complaint via the dealership.
Pending the update on Monday from the dealership I’ve 99% decided to turn down the incorrect car. I still hope that pushing back and letting them know that I will be putting in a complaint and that Motability are now involved that they might “magically” find that my correct order is in the system still but realise that is a long shot.
I’ll update as I hear more and thanks again.