Car Acquire Car Selling Company Springs Colorado

Kevin martin from car acquire called me after looking at my Car sale ad on Kijiji. He was so confident that he convinced me to go with them. and he went into detail and said "I guarantee your car will be sold in 2 weeks" I asked him what if it didn't sell in the 2 week period. I was told by Kevin "Don't worry there are so many people looking for this car at this moment that you dont have to worry about the refund and just in case we can't sell the car in 90 days then I would be entitled to a full refund of $374.99 and the administrative fee of $124.95. I called to cancel the listing after 2 months, since i didn't receive a single call from buyer and neither Kevin provided the details of the websites where my car was showcasing. Every time i called to speak to him, he was never there to answer my questions. He gave me false promises since the beginning and now it's been four months and i haven't got my refund nor anyone calls me. Whenever i call they talk so rudely and say someone will contact me from the legal department. I have been so cheated by this company and specially Kevin Martin. I lost my money as well as four months, i which i could have sold my car on my own instead of relying on these cheaters. Now my car's value has further dropped by 6000 Dollars. They do not honor their sales pitches at all! In four months they could not even find one interested person to call me to look for the call, forget about selling my car they were so much unprofessional lot of people who never keep their words. Company is full of liars and cheaters. I need my money back from these fraudsters....Please help