Energy rebate telemarketing call. These are actually now illega, as of 1/05/2024:

https://www.energy.vic.gov.au/victorian-energy-upgrades/about/telemarketing-and-door-knocking-under-the-veu-program#heading-1
https://www.esc.vic.gov.au/media-centre/telemarketing-ban-takes-effect-better-protect-consumers-victorian-energy-upgrades-program

Get the details of the company they're calling from and report them via:
https://www.esc.vic.gov.au/victorian-energy-upgrades/report-non-compliance-victorian-energy-upgrades-program
or by emailing: VEU (ESC) <veu @ esc.vic.gov.au>