You are in a contract with motability have you kept your part of the agreement by sacrificing your motability component
Answer yes
Have motability provided you with a car/ van that is
Fit for purpose
Answer No
Breach of contract
Will be very easy to win your case if you have to explain this to motability and things will start to happen quite quickly if not then get a solicitor to write them a letter and gues what motability will be paying for that too
Go get legal advice
Keep a record of all correspondence and get everything in writing
You have not received what is in a binding contract so the law is there to protect you