YellowPages

I have started an advertisement with yellow page for the last 3 months. I have paid them over $400. It was an over phone contract for 1 year. They guaranteed me that I will receive calls and emails from the customers. However the past 3 months I have not receive any calls or emails. When ever I tried to get in contact with my sales representative, it seems like they ignoring me. For the past 1 and a half month I'm trying to get in contact with him but no responds. Then I called the customer care, they keep on telling me I will be getting a call in next 48 hour but I never received any calls. Then I told them that since I'm a high school student I don't have the money to pay for their service unless I receive any progress but it still the same. I want to cancel my account with but they always ignoring me. Being a senior in high school I have to pay for my college application, so I keep telling them this, as if they don't care. When I told them I will stop paying then they said they will send it to collection agencies, however when i looked at my advertisement on http://adsolutions.yp.com/ it was showing my ads are pending, so in 3 months they didn't put up ad but charged me which mean they stole our money. so that's why I would like to know if you guys can help me fix this. It will be really appreciated. Thanks You