After reading a lot of posts about this eFax number from various web sites, here's something worth a try. The company sending the faxes is Iristel, Inc. in Ottawa Canada. Their phone # is 1-(416) 800-4747, then option 6 for the security department. Tell the person who answers that you want to file a harassment complaint against this 613 number and to have your number blocked from receiving any more faxes from this number. Also ask if you can get the Canadian law enforcement agency responsible for taking harassment phone complaints as well.

We receive several calls a day on our business lines, as though these people are trying to fax us.  You cannot call themback............please stop........this is annoying

This number called my workplace several times today within a 40 minute period, until we just blocked it from reaching our call center at all.  It didn't actually sound like a fax, just a slow series of beeps like a truck backing up.

This number keeps calling our land line... 6 times in less than 10 minutes! All it does is beep, like someone is faxing. Talk about annoying!

5 calls in the last two minutes. caller id says ontario ca. This morning diff number same thing with Atlanta caller id

This number has called me several times and when I answer its a fax machine.