Okay I just did some further research on this number/caller, and it is indeed a scam. For example, check here... http://800notes.com/Phone.aspx/1-(613) 927-9687 , dozens of people have identified this and reported it as a nuisance call.

Didnt pick up told me there was a lawsuit against me and i was to call back as soon as possible, havent replied

I just got a call/message from this exact number as well. Automated voice, claiming to be CRA (Canada Revenue Service), sounds legit and official, but I've called the number now several times to see what it's all about but after several rings it redirects the call and I get a busy signal, every time.

I got that earlier today (Saturday).  Just a robocall saying that they, CRA, had been trying to get me and will file a law suit.  That, of course, is not CRA methodology.  I'd know more if I called back, but I won't.

This is a scam!..the person claims to be from the CRA....the calls originate from India and use a Canadian number via VIOP. I right away realized that this wasnt the CRA and swore at the person in hindi, the individual on the other side started swearing back in Hindi!...it was quite funny!....just go along with it and have fun...in the end they will ask you to pay vis some electronic payment thing....i started laughing by that time! ...btw i told the person ill keep calling back every hour and make his life miserable....after the third time i think ive been blocked by them!

I just got the same message. My mother works for Revenue Canada and will be reporting this scam when she goes into work tomorrow.