I've had exactly the same thing. I want to buy a Vivaro. I've been to several main dealerships and also, amongst others, Vans Direct.
Vans Direct seemed only interested in selling me a VW Caddy for some strange reason despite me saying I don't want one.
I went to Frosts (in Shoreham, East Sussex), spoke to the bloke, looked at a van, said it's what I wanted, he was all over the moon, said he'd phone me, I phoned back maybe half a dozen times but no return phone call. My last phone call to his voice mail was to 'stick it up your ...........backside'.
Other companies also seem uninterested. I can pay cash if they want but .........
Is there a reason we don't know about?