The reason you are unable to call back is that each of these callers is actually caller from a real number but they are Primus customers, so their real number actually gets re-routed through one of many Primus main numbers.

My father has Primus and whenever he calls me the caller ID shows one of the many Primus numbers, usually I get (416) 646-3601, but I have also seen others.

So basically if you signed up with Primus today as your phone provider you too could make calls randomly to people and they would get a Primus # on their call display.

It is so frustrating and Primus should not be allowed to mask the caller ID number.

Some guy called saying to press 1 to receive my complimentary gift.  I hit 1 to tell the idiot to "$#%@" off.  Then there was dead air.  About 5 seconds later my doorbell rings, I don't answer because I was just about to step into the shower, then the doorbell rings again followed by a series of knocks on the door.

What are these idiots doing, standing outside my door and if I pressed any number they would have rang my doorbell?  Crafty Bastards!!!!

They just called me, put me on hold so I hung up, then called back from a blocked number.  Said she was doing a survey for a college project in marketing.  Really looking to see if our company wants to buy promotional products.

same problem same technics but they knew who i am i guess or maybe this number is usually used for scams. and they also call my friend to montreal by this number. i think it's simply hackers who gots nothin to do. but they can see the names of our numbers i guess so they got a little idea about us before calling.

When I pick up they speak Mandarin and then hang up.