Get a lawyer to file a DMCA complaint to their host, payment provider, and, most importantly, Google. We used this approach to nuke a Romanian cloner who copied our app.
Google might be able to help by adding the site to their phishing blacklist, but having them de-listed from the Google index wouldn't make any real difference. They don't rank anywhere visible now. What they do is list vehicles on other platforms like craigslist, and then direct people to their pages when they're contacted. That way they're not asking people to send money to some random stranger on craigslist, they're having them make a transaction through "Auto Tempest", a known car listings site.