Seriously, dude. If all else fails (and you don't fancy shipping the car to the UK), you need to replace 'victim' with 'nuisance/nightmare'. Tell them that it will cause a divorce, followed by loss of job & home, followed by suicide - all down to them. The good news is, though, they will get free publicity cos you will film it and stream it live to YouTube and the local media, while you wear a tshirt with the dealerships' logo on.
I'm sure they'd rather lose the sale than have to get court injunctions out on you.