So then you must have ignored their earlier notices right?
Stopping then right at the start is the best way to control them.

I use the "Privacy Act" in Canada.
I ask them if they are holding a written statement from the authorized representative giving then permission to use the NAME.
All unauthorized use of the NAME as stated in the privacy act would be subject to a fee schedule.
And I open an account for them for doing business with and give them an account number that they will be bill though.
Never here from them again.
Never give them your name on the phone, or birthday, or address.

Then they hang up on you.

But since you have a court notice, you let it go to far and now have more work to do.