I don't understand how this is getting so frequent. I guess it must be working or something. I put it as Prank call, because they just don't have the option "fraudulent caller".

Don't answer this call. Heck, if anyone calls you saying they can help you with fraud problems or claiming to be any institute which handles money, make sure they're calling from a number you recognize, or from a toll-free number.

We just got a call yesterday from Toronto (647 846 3308) for the same kind of thing. If you answer, hang up on those kinds of numbers.

Fed up of getting these accusatory calls of tax fraud. If you try returning the call, it's either a long distance or an out-of-service number. What is this?

Short answer...SCAM.  Ignore the call.

CRA scam caller! Called twice at 7am, hung up during recorded message. With all the publicity I can't believe they get any results!

Same scam, same number.