I don't call phone numbers on listing sites anymore, even if there's a face and an agency next to it. Better off looking up the agency, going to their website an calling that number (which in all three cases of the above, were different than the one on Zillow).
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* by "interesting set of experiences" I mean calling the number on a listing took me to an automated menu and a robotic voice where I had to enter the street number, and then first five letters of a street name so it could "look up" the property I was inquiring about, and connect me to the right seller.
Hanging up on that nonsense immediately and calling the leasing agency's number via their website got me a human being in two rings, and the leasing agent for the unit I was interested in after about 45 seconds of hold music.
This is something I noticed last time I was apartment hunting in Montréal. You'd see a sign or listing, call, and the number would be out of service. As if landlords were using virtual numbers/call forwarding services and just shutting it off once the unit was rented.