Similar to this targeted deal (you might get different amount too), but for next 2 months spending:
https://www.ozbargain.com.au/node/599635
Check your email for activation, here is the partial cut and paste version of it:
To be eligible to receive a $100 eVoucher, you must activate this offer by 11.59pm AEDT on 1 April 2021, receive confirmation that you have successfully activated this offer via the linked landing page, spend $3000 or more on Retail Purchases from 1 April 2021 to 31 May 2021
What’s up with all these Citi offers ??