Citibank offered free for life promotions many years ago. Many of us signed up for the cards then. They have subsequently offered free upgrades of the free for life cards for many of the cardholders. For example I signed up for a free for life Platinum card many years ago and they recently upgraded it for free to Signature.
I have not seen a Citibank free for life promotion for a long time. Recently they instead offer sign up bonus points promotions. I would not waste my effort trying to get a free card from the Citibank call centre. You could try, but it is very painful dealing with them and they have little authority to do anything. You could however ask to cancel and maybe they would transfer you to someone in Card Retentions who has more authority (i don't know if they have such department). You could also try writing them a letter to someone in Australia.