Thank you, they were able to confirm that our application (sep 15th) has been opened and all documents have been validated, meaning that the application won't be sent back as incomplete. We requested a temporary number so we could update our address (so we've moved now to Canada while we wait), and they gave us a code with the XF***** format.
So for anyone in a similar situation that needs some official response from CIC, they could try calling this number as well. As far as I understand, there's not a whole lot of things you can do with this temporary code, but it's useful for updating important information or maybe even to obtain a documental proof to enter into Canada during these troubled times, although that's a whole other topic in itself!