You can apply for caips/GCMS notes under the Privacy Act(free if you currently reside in Canada). http://www.cic.gc.ca/english/pdf/kits/forms/IMM5563E.pdf
If you are not in Canada, you can request it under the Access to Information Act - it costs $5 and you need to have someone physically present in Canada like a Canadian citizen, holder of a work/study permit or permanent resident to request it on your behalf. So you will fill out form http://www.cic.gc.ca/english/pdf/kits/forms/IMM5563E.pdf
and http://www.cic.gc.ca/english/pdf/kits/forms/IMM5475E.pdf in addition to
In the future, keep a copy of your complete application.