Yes I’ve experienced this. We ordered our car in June but the dealership didn’t order it until July and came up with all excuses as to why it didn’t happen. Motability wouldn’t budge and the AP had jumped up from quarter 2 to 3. I stuck to my guns and eventually the dealer agreed to pay the difference. You need to find out why they didn’t order the vehicle on time and stick to your guns as Motability won’t back down.