It is a spoof company calling itself the "Service Centre" and trying to get you to give them access to your PC. I just tell them that the police is informed and they hang up. A tedious nuisance.
Just received this call. When I answered, there was just silence. Again I said Hello louder, again silence than the person hung up. Caller ID indicated "unknown name".
Want to put an end to this unknown caller, and the phone calls from number 212-777-3458? After the call is made, YOU push star 51 on your phone, then hang up. That number immediately flags the phone number to your local phone provider as a harassing caller and is traced. Do this 3 times in a row after each time that number calls you, your phone company will automatically block that number from calling again. Sends the party of that number a letter of harassment and unwanted phones calls, as well as telling them why they no longer have phone service.