Called looking for a relative of mine I don't even live with. She asked if I could give them his number/details. I responded, that instead, she should give me her name, name of the organisation, and number to call her back on and I would pass on a message. And she flat out refused. Definitely 100% sus.

Caller: MCML?

Update. Had another call from this sus entity. Again looking for my (same) relative. And even confirmed, with this one, that they had indeed called before. Again for "privacy" reasons couldn't disclose anything as why they wanted to contact my relative. I did manage to press her for an entity name she represented, and she said NCML but would not disclose what the acronym stood for. I queried how they got my number and why they are still calling me when we already had this conversation about not having the correct number and she apologised, "I don't why it wasn't taken off" and that they got my number from a "third party" again for privacy reasons could not disclose who the third party is.
This time the call was from a private number, because I blocked the last number (03) 9225 2088.

Gertrude ringing
Where are you from Gertrude, Melbourne Victoria, Call discontinued due to evasive nature indicative of Phishing scam

Caller: 3 9225 2088

No one answered but the line was open, scam I think.