I had a similar issue. After filing an info request, I was falsely told no info on the subject existed. When I said I had some info already, they told me I should've told them that. They then gave me a few internal emails that discussed how little information they could "get away with" telling me.
City manager’s emails scarce on details on how 5-day return to office mandate came to be | CBC NewsAs the City of Ottawa’s 'new standard' for five days in-office begins in the new year, internal documents from the city manager’s office show how Wendy Stephanson planned to defend her controversial d...www.cbc.ca