"Canada Revenue Agency" called from (902) 432-5689 for some guy that was a wrong number about his business.  Asked him to call back 866-749-4173.  
Here's the info from 411.com:(902) 432-5689
Provider: Aliant Telecom
Location: Summerside, NS
I googled the (902) 432-5689 and it came back something else.