Not sure what you mean, can you elaborate? "In theory" you can contact the CB if there are erroneous entries under your name, though to see those you need to get periodic CB reports to see what all is listed there... which can be a pain in the arse to fetch. I admit I've never personally had to cancel/dispute anything though, so I'm not sure how easy that process is first hand.

My personal pet peeve about credit scores in Canada, is that they're all maintained by companies with ties to US parent companies. Equifax is a good example, where tons of sensitive information gets submitted, and it's potentially within reach of the US govt. As an anecdote to clarify why this bothers me -- I recently worked for an org that submits regular data extracts to equifax for credit bureau purposes. There was an error on a submission that required fixing. They told us they were going to charge us ~$20k to correct the error (which is crazy, as the org was a small business). We pushed back, basically pointing to Canada's privacy legislation that states we as an org have an obligation to inform other orgs of issues/mistakes, and that they have an obligation to fix it. As part of that, we asked them to confirm they were in compliance with Canadian privacy legislation.

Instead of answering, they dropped the $20k bill and fixed the mistake.