Hello Timmy,
After many months of lurking on this site whilst considering the best course of action to facilitate the mobility part of my particular disability, I have now joined just to allow comment on this post.
Firstly, it would be easy to take shots at this post, so I think you need to clarify your situation to allow the educated and informed forum members to help you better. For example, assuming your particular disability is physical based on your difficulty getting in and out of a regularly sized car, did you not try the car first? Did you have a test drive where you examined your ability to live with this vehicle for 3 years rather than look at the style and badge kudos? Did you not sign to say you agreed that this vehicle satisfied your needs? If you weren’t given the opportunity to test drive the car or sign to say it was ok then you have cause for complaint, to both the dealer and Motability.
If, however, you did have these opportunities and still signed up for an unsuitable vehicle then you should expect the financial or physical impact on you to be significant. We all make mistakes, but you have to pay when you do, and to expect the business who supplied you in good faith to absorb the cost is both unfair and unrealistic. Also, and I think this is my main point, most Mobility customers experience some degree of difficulty with motor retailers, and it feels like a fair proportion of this is down to the ability to refuse the sale for any reason, at the last moment. This gives a great deal of power, one that retail customers don’t have in anything like the same way, but with that comes the responsibility to not abuse that system. To do so is to endanger the relationship that the motor industry has with Motability customers, and cause further distress to your peer group in the future.
I’m sure your particular situation has more to it than is evident, at least I hope it does. For what it’s worth, I hope you find recourse, either through mediation with the various parties, or by acceptance that you need to accommodate some discomfort to facilitate a Mercedes Benz. I just hope that recourse doesn’t reflect on those next in line.