Have you looked at Motability themselves for prices first? In my experience a lot of businesses don’t really care about online contact us style communication. I’ve emailed dealers about sales before and never had a reply. Emailed VW dealer about whether they even had a car to test drive got a reply weeks later.
I don’t generally do phone calls not so much as hard of hearing but just generally find speaking on the phone very uncomfortable.
I filled in the form for a 48 hour Skoda Enyaq test drive last night we’ll see how long that takes to get an answer.
Other than going to a dealer yourself I don’t know what to suggest other than try contacting a different dealer and see if you have better luck with them.
Crayford and Abbs my local Nissan and MG dealer answer emails very fast. I’ve emailed for a service booking and I’ve had a reply with booking minutes later I’ll be sad to leave them next year tbh
Good luck