That’s a query many potential clients come in with and they are normally distressed at this point. Understandably so. Wikipedia is the front page of the internet and a search for you name will generally show your Wikipedia page first if there is one. So when false or outdated information shows up, it’s certainly a cause for concern. Let Wikipedia Writers give you their input.
Firstly, Wikipedia has bots to detect vandalism. They are not very effective but if you are lucky, any nasty information added to your page may automatically alert an administrator or Wikipedia editor and they would generally reverse the changes that may have been made by the troll -this could be anyone; the employee you fired, your competitor etc.
If you find the changes made to your page are false, you may contact Wikipedia and they may in some cases reverse the said information so the page is restored to its original state. Wikipedia admin is not always helpful and may not be willing to fix particular issues.
You could also go in and try to remove the information yourself but unless you are fully informed about Wikipedia procedures and policies, this option could make the situation worse. It could lead to a conflict of interest flag being placed on the page, and your account being banned as well.
Your other option would be to hire Wikipedia Writers to help take over the case for you. Yes, it would cost you a bit of money but it will definitely give you peace of mind knowing you have an expert to deal with the mess. Not only would we be able to reverse the nasty additions, we could also help ban the troll altogether. It could be their username or if their IP address depending on how they made the edits. In addition, Wikipedia Writers could also help you update the page so it reflects all the latest information about you or your company so readers aren’t misled. In addition, we could also help monitor the page against future trolls so you never have to worry about what’s showing up on your page.
Whatever you do, make sure to regularly check your Wikipedia page so your image is protected. Or you could hire Wikipedia Writers to take the stress off of your shoulders!