If you drive back to him and park it on his desk it will get his attention!
As a rule, I don't like dealers but I will say there are a few good ones out there. I bought a Mercedes ML a couple of years ago from a dealer, looked at it in their workshop on a Sunday morning where it had been put up on the lift for storage and it took us a while to work out how to power up the lift and get it down. While under there I found some serious oil leaks but they promised to rectify them so I put a deposit down. They sent me videos of it with the gearbox out and a new rear main seal plus some other bits we'd discussed and I collected it a couple of weeks later (they really got burned on it for the problems it had) but sure enough, they rectified them. I took the car home, and the next day there was oil on my driveway and a lot of smoke from an exhaust crossover pipe behind the engine so I called them up and told them that I really wasn't happy with the car and they simply said "we'll give you a refund if you'd prefer". I went for that. Took the car back to them as they'd been so reasonable and I could, they processed my refund, we shook hands and I left.
Not really the outcome I wanted as essentially it could had been a great car and I do love Mercs but overall, not the worst experience. Sorry to hear your dealer isn't being as forthcoming.