Receive this call quite often, I do not answer but they do not leave a message on our answering machine,. Who is behind this number?

I called this number back because they kept calling and never left messages.  Oddly the number was no longer in service.  Obviously a scam.

It appears to me that this number is associated with air duct cleaning services. I had no picked up when they called me but they took the time to at least give me a message. It's a bit muffled up as they don't like talking to machines.. no pun intended but it is annoying to be getting calls like these when our number is on the CRTC's DO NOT CALL REGISTRY!!! It's a bunch of BS if you ask me. I had told them more than once before when they called to try and sell me services I didn't require if they followed the registry and if so to kindly take me off their list as it's harassing and very annoying.

Just filed a complaint about this number as we're getting harrassed on a daily basis.  I encourage others to also file a complaint so that they can build a serious enough case to get this guy off the phone:
DNCL #: 1-866-580-3625.  Same phone number to complain and/or to get your number on the do-not-call-list.

Unknown number, didn't pick up.  according to the comments its a telemarketer, duct cleaning.