If something goes wrong, they have found that easily knock near the door or pickup the phone and complain to their hearts' desire.
It'll take some common advertising models to do the trick, but let's say you aren't knowledgable about things like Pay per click or SEO? https://youtube.com/playlist?list=PLbZg6jL4FgfAS0TjMKfQ3hKiYOikfzmuE