Sorry for your misfortune.
I learned from the CIC website that when an applicant gets cancelled, the profile will be terminated permanently. So you need to create a new profile, either by using the same account or not.
I strongly suggest you check out the details at their official website.
In some cases, if you have convincing reasons, they may consider reopen your profile. So why don't you post the possible reason behind the cancellation, so that some people here can help you look into the possibility of a reopening request?
Good luck with you!