If your business is listed on a rating site that allows business owners to respond, make sure that you take advantage of this. Whether the feedback you are given is good or bad, you should respond to it. Thank people who have nothing but praise and offer something to those that are unsatisfied.
If you search online for your company and find erroneous information, you can try to get the owner of the site to remove it. If you can just show them that the information isn't true, most site owners aren't going to have a problem getting rid of it.