Telstra was kind enough to reply with some useful links on how best to report this. Kudos to the Telstra SM team, they receive a lot of grief from customers all day and still come through. It takes a special type of person to stick at that job.
For normal every day reports head over to https://say.telstra.com.au/customer/general/forms/report-damage-to-telstra-equipment?red=social-care-LSW:rwwr
For equipment that may contain asbestos report the problem to 1800 067 225. More information available from https://www.telstra.com.au/aboutus/media/emergencies-incidents/asbestos.
Optus have a page at https://www.optus.com.au/shop/support/report-damage/ which can be used to report problems with their equipment.
I wasnt able to locate any information on the Vodafone or NBN pages. Suggest you try contacting them through their regular contact pages on their websites.
I’m sure there are other telcos ive missed. Happy to update this list if you have information to share.