The call number today was disguised as 4414165301677. On closer examination the Toronto area code is buried in the number.
This was yet another of the duct cleaning companies and, again, I told them I was on the Do Not Call list. Further checks showed that the number used to belong to the Sugar Ridge Retreat Centre, but they are now in the 705 area according to their web site, so the old number has been recycled, presumably, and has been picked up by the duct telemarketers.
Constant calls from air duct cleaning company .. next time the whistle is coming out .. yelling does not appear to deter them from calling .. telling them to place me on the do not call list does not help either