Motability nor the dealers would be able to do anything yet anyway and I can only see the AP getting reduced if the next quarter released before you collect sees a reduced AP.
In the letter with your PIN number on doesn’t it tell you don’t enter the pin until you are certain you are happy and the car meets your needs.
Once people start to return to work if your still in the same financial situation ring motability and let them know and then the dealers.
The dealer won’t loose anything they will just sell the vehicle to someone else.