What a shambles. It’s hard to say the dealer owes you anything, unfortunately, because Motability Operations is their customer, not you. So any compo is going to come from Motability Operations. I would not for a moment feel guilty about taking money from them. They are a commercial operation swimming in funds, not a charity. (They operate the scheme on behalf of the Motability charity). And they are, of course quite free to pursue compo from the dealer but will no doubt find it easier not to bother.