Clean up Web reputation and Image

An ex employee who parted company with us on not so friendly terms has been posting untrue nasty things about us on the web (at several sites). We need those cleaned up and done quickly. Please bid for the project and indicate how long will it take you to do it and what you can do to achieve these goals. I am not sure if I have provided all necessary information for you to bid. Will be happy to answer any additional questions.