Sounds like someone at CPC-M or Etobicoke was click happy. Happens. Ask around... I bet there is a crazy BadAss Jamaican around here (
@meaningful1 here's looking at you, kid!) that was accused of being in the Afghan police/army. Total mistake. Button click. I would just supply the info they asked for and a letter that states you're unsure what's happening.
You got an AIP letter. You got your OWP (which means you passed AIP).
You could also reach out to a local MP's office. They can get it sorted for you (ask your husband to do this -- or to start the ball rolling with them). They have a special line they can call and they don't wait on hold like we do.