When you get these calls. Just answer, but don't say a thing, and they just hang up with out saying anything. They give up and stop calling after a while.

Called here twice today, but no one there when i answer.

Yes, these a***oles call my number too !

Just make an appointment for duct cleaning and when they show up say your not interested and shut the door on them.

So pissed off, I think the police should look into these companies offering Duct cleaning.  I believe it is just a front to get into your home and do a lousey job, case the house for future roberies.If I want ducts cleaned, the last company I would use is one that harrasses people by calling from unlimited phone numbers several times a day!  I was as nice as possible for years, asked to be removed from their calling lists, but no longer.  They get an earful of swearing some of the most horrible words I can think of.There is no list they still call back.  My 30 # call blocking is full.  There has to be a solution.