I bet the information you put in the CAS has some errors, please double check and tripple check every piece of information, e.g., File Number, Last Name, Birthday, Place of Birth etc. are correct and as in your file. Once the file is available in CAS, it will not just disappear by itself and cannot be "cannot be found" -
I called CIC today, unfortunately they said they have returned my application even if I've already recieved an AOR. Do you guys know if i'll start from the end queu again when i resubmit it or i just need to send it back coz they already gave me an application number(AOR)?