I was very surprised at the end of our talk that they didn't even try to create a real contract out of it. Just a talk was enough for them. As it's enough for nobody and almost any normal situations. Even a grocery store gives more legitimacy to their dealings with you.
I tested them for a good month and saw that their ads were worthless, so I went to cancel it. A marketing company that gives no Return of Investments has to change things or will stop being employed. Their responses has always been towards me "$#*! you, pay me", to paraphrase. Oh right, once they also told me their inability to get me people in the door was my fault.
When using the same type of online ads by myself, I had good enough results. I figured a professional would be able to get me even more. But they are not able. Actually I've never seen a worst marketer in any single way than YellowPage.
I ended up just stopping their ability to use my card and ended up paying a fee for it in exchange for a letter that basically said we're all good.
Any other company or business would have done better. Any one of them. I've never seen such an ineffective business, with such overwhelmingly worthless results, and probably the worst customer service I've experienced in my life. It felt like employing someone in my business who decided to do nothing at all all month, then tried to sue me to get paid for the whole year.
Whatever you do, don't deal with Yellow Page.