Waste their time and cost them money.  Go through with the call and tell them you will get your ducts cleaned. Tell them you moved half a year ago and give them a fake address (your local police stations or fire departments).  Tell them that they called your office number and you are not happy with that and ask them to change your number to a fake one.  If everyone does this you will waste their time, cost them money and embarrass the telemarketing firm, because whoever got the call will be lambasted by the guys who show up at the fake address.

got a nut case that keeps calling and hanging up a few times every day from this number.must be having a lot of funGod help him if we manage to catch up to him!

Give them an address in some remote area. Or better yet, send them to a police station or fire department.

Got a call from this number tonight. Did not pick up. I let it go to the answering machine. I don't think it is automated, as the person did not hang up quickly enough before the machine started recording. I heard air, then a click (when the person obviously hung up). Did anyone from outside the 416 area code get a call from this number?

If this is regarding Fresh Air Duct Cleaning, two threads you should read in their entirety:

http://800notes.com/Phone.aspx/1-(416) 222-2333/2#p154598824043980162

and

http://www.complaintsboard.com/complaints/bsr-enterprises-legal-toronto-canada-c199878.html

someone called from this # today stating they were calling from Bell Canada, Then asked if I had my home phone service through Bell. I asked why he was asking that if he was calling from Bell and he hung up!