This morning my client contacted me that another business is using their address as their own! They received a Google verification postcard with pin number on it, but luckily had the foresight to not give it to the person when they called. After some research, we also found out that they are using our address on Facebook and LinkedIn as well. The kicker is: this business is another SEO firm! You would think they would know that using our address would cause NAP issues for their own business. Has anyone dealt with another business trying to hijack their address for local rankings? Any advice on steps to take to report this abuse would be appreciated. Since this person is obviously unscrupulous, we don't want to provoke them into taking any other negative action online that could affect our business.