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

I got the same message , I though some one is kidding, called back no response, CRA does not have my cell number too.

Exactly...same message

Odd call from (613) 927-9687 - left call back number -  when calling back they identified themselves as Canada Revenue Agency.  All on a Saturday morning - quite irate that I could not tell them what my call was about when I was returning their call.

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.

Picked up the phone and it's a recorded message from someone who says they are from the CRA and they have been trying to get a hold of me as they are filing a lawsuit against me. The message sounds official and is asking me to call them back which I have not done as I have already heard that this is a SCAM.