If by any chance you have edited a company that wasn't your company, you can undo this.by hovering over your User name, then, on the Dropdown menu, select "Edit my business".
Once there, click on "Manage Businesses",
Then,click on "Settings"
Once there, select the company that doesn't belong to you, and click on "This is not my Business"
A question will be prompted to you to verify you are sure.
Please note that all the changes, including information updates, products, photos, company, will not be saved, since it will be shown as it was before editing it.