Do you have any evident that you submitted the correct file? There was a possibility that you submitted the wrong file. Hence, even you had a green checkmark, it wasn't meant that you submitted the correct file. In addition, if this is really a technical leak, there will be many other applicants who were wrongly rejected with the same issue during that period. My point is that it's hard to argue with CIC for this issue.
You have a better chance to submit your application again. If you are a PNP, you can get ITA with 600 points in next round.
You can try Case Specific Enquiry for your case. Good luck!