I have been working as a freelance PPC Manager for the last 2 years and have recently set up my own PPC website.

Most of the work i have currently done has come from agencies - they have provided a lot of the clients i have worked for.

On my new PPC website i have listed the clients i have worked for under experience but have not explicitly stated they were clients of my company. Instead i have worded it as "our staff have experience working with the following clients".

I did not get permission to use the logos on my site but i did not think it would cause a problem and i did indeed work on PPC campaigns for all the companies listed.

I have today received a letter from a big law firm asking me who gave me permission to use one of the logo's on the website.

I do not know how to handle this situation.

Any advice is appreciated.