Yes it's for air duct cleaning, It's been going on for years. One of the reasons why they get away with it is. They call from India and they spoof local 416 and 905 numbers. If you call the number back this is why you get the message "This number is not in service." Last night the CBC Marketplace did a 2 part show on
telemarketers. Here is the link http://www.cbc.ca/news/business/story/2013/01/10/marketplace-offshore-telemarketers.html
Next week is part two of the show.

Caller calling me since three days almost 11 times from (416) 555-9151, just right after pick up the phone got hang up. I returned call and foung this number is not registered . I want to know how to get rid from this phone call

These idiots have been bugging us for almost a year.everyone listed above or who reads this should call the corporate idiots at Bell and complain and then call the bureaucratic idiots at the CRTC  and complain and then sit back and relaxing knowing full well no one gives a s***!Sure am glad I put myself on the Do Not Call List that the idiot CTRC boneheads created.

came up on caller ID as 011-416-555-9151...maybe some long distance routing...not sure.I have been getting repeated calls from Air duct Cleaning Services.  The moment I ask where is your office or any details they hang-up.I have repeatedly requested to be removed from thier call list and told them I am on the do not call list.Anytime those things are mentioned, the caller hangs up.

Same thing happened to me.  He hung up on me I'd mid sentence.  Idiot!

your dealing with a foreigner, a dirty little p a k i , you can only call him what he is a filthy little lying stealing p a k i dog