“Also one dealership said we would not get a charging point OLEV grant because we are getting the car through Motability and not purchasing it new, like normal customers.”
This dealership is telling you complete rubbish!! Really they need to be hauled over the coals for this. In your shoes I would report them to Motability.
My Install detailed above would have cost £859 all in. I filled in the OLEV paperwork sent by Pod Point as a Motability customer and this went straight through at the £500 standard grant. This left £359 to pay, which came through from DS, leaving me £0 to pay.