Surprised to receive a letter out of the blue upgrading me for free to the Signature card from Platinum. Maybe they noticed that I haven't been using the Platinum card since the change. I did not call them or anything, the card just came, and I just had to call to redeem this upgrade.
I had to resort to Facebook to get an Australia CSR to contact me. The best they could offer me was an apology and 5000 points, however they said Citibank was well within their rights to change the points requirements as the T & Cs say they can change the points value of rewards at any point. I'm still hoping for an upgrade from Platinum to Signature, but I not holding my breath.