The people behind this number will claim they are with "Canada Federal Crime Investigation Department" and they will try to extort you by saying that you owe money to Revenue Canada and if you do not pay right away that they will issue an arrest warrant.  An official complaint was filed with the RCMP and it was discovered that these calls are origniating from Pakistan and they are spoofing the number with a number from Kingston Ontario.  The bottom line is do not give away any personal information to these crooks.