I have started to receive calls from 604-304-4025 this week. There is no one on the line and when I call the number back, I get what sounds like a recording picks up and says "Delta" (my area)
According to Google, the phone number is in Richmond BC

This is a fraud campaign currently active in Canada using a series of VOIP numbers.  The objective is to obtain your credit card number and drain your account.

If you attempt to "opt out" your number will be confirmed as live and added to a suckers list for repeated future calls.

  I have gotten at  least 10 calls from this number in the last week and a half. Once in the morning and another in the afternoon. I believe there is another number circulating as well. Haven't got it off-hand. Same MO .For the most part I've been ignoring them, but when I did call a couple of times the other end answered with "delta" and immediately went to "leave message mode

Same for me - I often get called by 604-304-4025 and no message is ever left if I'm not here, if I pick up then I get 'delta' - so I hang up.  I now do not answer it as I have call display and see the number.  Surely something can be done about this in this era of technology and it can be traced!

So why don't authorities trace them.  Someone issued them this number - why cant they say who it is.