If you want to cause them pain it is surprisingly easy to use the Internet if you are willing to throw good money after bad.
You can place advertising on Facebook and choose key words that would result in you coming up alongside their imprint.
1. Register a domain Crap-car-sales.co.uk or some such
2. Place "an example of a bad engagement" on the home page
3. Invite others of this dealer to name and shame them
4. Say more people should contribute to others
5. Make up a banner advertising the site with this dealers name in the headline as the lead article.
6. Place the banner advertising on Facebook with the correct search keys to get it surfaced alongside target audience.
I would recommend their dealer name, location, porsche, car buying, autotrader, trading standards and other things that would lead to a good spot of brand association.
You can also do the same with Google advertising.
If you can then get the local paper in their location to cover it and add some search hits to it all the better.
Do this on a friday evening and pay one of the SEO engines (hundreds of people in China/Indonesia) to cause it to rise up the search ranks. They will not be monitoring social media until Monday morning and so you get a weekend run at them.
Then push the story to the press.
The Register is a naughty web site for IT that would love to cover the IT angle of retribution and would get you a lot more hits.
Some of the red tops like the Daily Mail would also love to cover the "owner gets own back using google" angle as well.
Play your cards right and you should have change of £5k
Not that I have done this mind you.
Do beware that if you take this route the result will most likely be a do or die card. If you do it then follow up with a call saying "have you seen this, its just the first stage, do you want to resolve this or not ?"
If you don't then the likely chance is that they will sink there heels in and fight you tooth and nail thereafter.
Fortune favours the bold. Some people need to be shamed.
