if they call again just ask them to take your name off the list as they will have to by law, also just make sure you dont do any surveys or when you apply for stuff make sure you tick the box that says you dont allow ur details to be passed on to other companies offering there services.
This is how they get your info and same as the courts any ccj as soon as its passed in court it will go on the public domain the same day and there is nothing you can do about it unless you dont let a ccj happen to your self