The first time these guys called it was from 613.236-1765 and then, the next day, it was from this number.
On my call display it says TSC - which in Canada means to me either the chain of rural equipment stores 'TSC' or the short form for the Canadian Home Shopping Network "The Shopping Channel".
Obviously, I'm just guessing at who these people are but unless I'm in the mood to b!tch someone out, they won't ever get me on the phone to confirm this information.

I am getting multiple calls each day, including Sunday, from this number. It is a call centre as I can here people talking in the background and the person on the other end is young and unprofessional. I ask them not to call again, but a few hours later the number pops up on the call display.