They don't only know your address, they have access to Bell Canada records and they know exactly who is calling you and who you call so, if you call the Police to report them, do so from a neighbours phone. They also know the names of the people in your house.  This Rupen Balaram-Sivaram is a disbarred Tamil Paralegal now servicing Duct work.  He networks via Bell Canada    Check his Facebook if you really want to see something.

Rupen Balaram
http://facebook.com/KoovaamPuli

Hey, I had the same encounter with the same number they keep calling us, i told them to stop calling us and they said they will call even more now just to piss us off, they also seem to know my address.

Called me to offer duct cleaning.  I asked to be removed from their list and said I'm on the do not call list database.  He said he does not care about the do not call list database and wants to know why I don't want my ducts cleaned.  I said I want my name off their list and he still insisted on selling the service.  I asked for his supervisor and he said he is his own supervisor so I can only deal with him.  He was very rude.

http://www.stormfront.org/forum/t661071/

Called me to offer duct cleaning. ?I asked to be removed from their list and said I'm on the do not call list database.  He said he does not care about the do not call list database and wants to know why I don't want my ducts cleaned.  I said I want my name off their list and he still insisted on selling the service.  I asked for his supervisor and he said he is his own supervisor so I can only deal with him.  He was very rude.