When that "011" in the beginning shows up, it is an international caller - am thinking the report about a scam from Malaysia could be correct after researching this number on so many sites and now seeing your report about the difference in the numbers.
Hmm i didnt call the number back... but they called my cell as well and didnt leave a voice mail.. weird thing is. they called twice but one number came up 011-604-8432121 then not even a minute after, came up 1-604-843-2121.. kinda of one of the reasons i didnt call them back. they havent called back since. hope someone figures out who it is that is calling.