What If somebody will write about my company ...

Hello guys and girls.

I have searched the talkfreelance forum but didn`t find informations about this.
Meybe some of You have had that kind of problem so You could help me.

What should I do If some of my clients not satisfied with my cooperation with him would write something wrong about my company on blog or some forum like this ? That could be a big problem for me beacouse working with clients I am creating my opinion . I have searched on google about this - I know that there are firms wich can remove bad information from google but It costs about 1000$ per month it is big amount of money for me .

Thank You very much for all answers.