As Psuader said you had the right advice from early on. In my experience once you ring Motability they are extremely helpful. I recently had a dealer telling me porkies, rather than get into conflict I rung Motability and they had a word and then put the salesman on the phone to me who had to then back track!!! Call them, if its your word against theirs its difficult to prove, if you have any BMW paperwork then your laughing!!