Crank call from someone pretending to be from the Cdn Revenue Agency. She left a message on my voice mail that I owe taxes and legal action will be initiated unless I call back right away to some 800 number.

Whatever the history of calls from this number, 416-333-5400 rest assured there will be no further complaints regarding it. I have just acquired this number for a legitimate business.
Thank you!

Yeah that is really believable.  Did you know that I have found 3 pots of gold at the end of 3 different rainbows?  Yep, I did.  Hey, my story is as believable as yours.  Tell you what, you give us the name and address of this "legitimate business" and then we will check it out ourselves.

Just because you've "acquired this number for a legitimate business" doesn't mean there will be no further complaints regarding it. It can be spoofed just like all other phone numbers so of course it can still have complaints regarding it.
By the way, why did you even bother to look this number up?