This is the Green Party of Ontario, calling for support. If you want off the list but you don't want to pick up the phone, you can email admin @ gpo.ca or call (416) 977-7476 (or +1 888-647-3366).

It's the Green Party of Ontario, not Canada.

If you don't want someone calling you, all if you have to do is pick up and say that.

They called me & asked for me by name, then hung up when I told them that they had reached me.

Called once last week and twice this week - didn't leave a voicemail

The phone number (647) 725-2170 originates from a robot dialer operated by Globility Communications Corporation.  Globility Communications has an F rating from the Better Business Bureau.  647 725 2170 is not the full phone number.  This robot dialer is using a couple of international phone numbers 011 64 7 725 2170  and 011 1 647 725 2170 to cover its identity.  It is unlikely that the calls are originating from a political party who trying to gain your support.