Contact plaintiffs' attorneys (the ones suing) and explain you are not the company they are seeking; providing any evidence that will support that statement, such as the address, name, etc. of the actual business they want to sue (if you know it), evidence showing that your business was not involved in whatever transactions or line of work they are suing about, etc.If you are actually named in a lawsuit--that is, despite the above, they sue you--you may be able to get the case dismissed early, on a motion to dismiss or motion for summary judgment, but are advised to retain attorney to do this: it is not easy for a lay person to file these motions. You may also be able to seek attorneys' fees from the plaintiffs, for having brought a frivolous lawsuit against your business.