[source: Audi South Africa Twitter, Mercedes-Benz SA Twitter] The Audi vs BMW billboard war is legendary and some say Audi won that war so when Audi South Africa  spotted Mercedes-Benz SA using a Q7 as a camera vehicle, they couldn't help themselves: [embed]https://twitter.com/audisouthafrica/status/996727000638386177[/embed] Mercedes-Benz SA wasn't the type to take that lying down so they counter attacked and threw an ad in for good measure: [embed]https://twitter.com/Mercede...