I’d walk.
As far as you can. Keep one thing in mind, you’re not done with the dealership after you type in the PIN and take delivery. Do you intend to sit next to your car for hours (sometimes days) on all services/repairs to make sure that they actually do what they’re billing you/motability for?
I accept that it’s going to suck to wait longer, absolutely do. But honestly, i’d rather wait 6+ months and get into a good (honest) relationship with my dealership and “my” salesman, not to mention get the car i actually wanted in the first place rather than a lower spec one. This dealership has already proven that they’re crooks, trying to screw you over (in fact, lied knowingly straight to your face multiple times).
You’d be stupid to continue to rely on them. In fact, just for shits and giggles, i’d ask them to send you a screenshot of the order in their database, and check what they actually ordered, and when. If they decline, you know they’re lying – other manufacturers happily do this (VW for example, as can be seen on the last page of the R-Line thread). The fact that he admits (smugly, imho) that complaining won’t do anything since his manager knows anyway, jesus.
Yeah, nah. I’d walk from this turd of a dealership and go somewhere reputable. I’d also make the situation crystal clear to Motability, dealerships can be reprimanded for bullcrap like this. Indeed, we could’ve had our Golf GTE within a few weeks (a dealership had our spec/option pack coming in as a “lot-car”, albeit instead of our flat grey, a metallic grey colour – no big deal), but decided to wait 6-10 months by going with a different dealership that simply made an effort to get us as a customer. Starting from having a GTE test drive where the car was actually charged, teas, coffees, being honest about the car and its drawbacks etc.
To us, a good relationship with a dealership is as valuable as a good car in the first place, since there’s a high potential that we’ll be back with them in a few years. Bit like a hairdresser, i drive 20 minutes to “my” barber, rather than using the two that are literally less than 100 yards away from my door. Same thing.