Oct.11/14 at 12:44pm - Display says 'Unknown Name' at T: 647-559-2575.  No message was left.  Area code is for the Greater Toronto Area.  Canada 411 reverse lookup says its not a Canadian Business number, nor belonging to an Individual.  A general Search turns up a posting that it belongs to Iristel - a VoIP service provider that is located in Canada but also has international business dealings.  Will be making my complain on the Canadian CRTC's Do Not Contact Registry, since this is a Canadian Business - with the number of complaints about this company in the past, I hope they get hit with a massive fine.

https://en.wikipedia.org/wiki/Iristel

From this number 6475592575 I am receiving many calls a day , no one answers. I want to block it but don't know how

This phone called several  time per day. nobody talking.

He said he's calling from Eco Energy Co. I wouldn't listen anymore and hung up.

Oooopppsss We missed your call.  Your call is very important! Call again and our answering machine will be more than happy to take your call.