I would for sure NOT ignore it. At least reply (CSE), referencing the request email and politely state that you already included "original" (not copies) police certificates for all required countries with your initial application. Mention that a CIC (IRCC?) call centre agent instructed you to let them know this. Also, say that you would be happy to provide them with anything else they deem necessary.
Something like that. Actually, the call agent should have send a note to the agent working on your file stating all those details.
If you just ignore it, there is a chance that the officer will go to look at your file to see if you responded to their request for documents, and see that you never responded, then just refuse and reject your application.
That's my suggestion at least. Hope it helps!