I am sorry that you feel this way. As honestdoc said previously, the mercury that is in a amalgam filling, is non toxic since it is in combination with other metals.
Please find attached, just one of the many, and I emphasize many, peer-reviewed articles that try and illustrate that there is no clinical evidence to show that there is a need to discontinue the use of amalgam or to remove clinically acceptable restorations.
I have highlighted a paragraph that will hopefully try and explain what we are trying to bring across.
You can take some time, and read up yourself on all the decades of research that was done on this topic. Just go on Google Scholar and have a look.
I am sure, as you have stated, that you are also a professional person. Rather than taking a dentist to court over one filling, have you tried asking the dentist to replace the filling with a filling more to your liking? There is no need to rush to court-I am sure you would understand if you were in a similar situation. I am not even sure if the case will be taken up to be honest either way.
There are risks when removing a filling that is clinically acceptable restoration, such as Honestdoc mentioned. Foremost possible pulpal damage or additional tooth structure loss. But an amalgam filling can also be safely removed under the correct protocols as we are taught as dentists.
I really hope that you can ease your mind when you take the time to do additional research, and to know that no harm will come to you.
And in the future, please ask your dentist to not place amalgam restorations.