Getting Calls From A Telemarketer?

There is a company calling from foreign countries using other company names. They tell people to
"Call the service man on his phone and not the number on this website"

This is the first clue they are trying to scam you.

Check out this video link by a CBC television show called Marketplace for a segment that was recently televised about these scammers.
http://www.cbc.ca/news/canada/offshore-telemarketers-sell-ripoff-ductcleaning-expert-says-1.1352453

If you feel you have been defrauded by these people, click this link to alert the Police and let them know what happened.
http://www.rcmp-grc.gc.ca/scams-fraudes/rep-sig-eng.htm