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.

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

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

the **** is from TO

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

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.

He called b4 and was really nasty wanna me suck his hairy balls after i asked 4 company name and number a gay **** i guess send him back home so his country will cut it off