No point to drown in your self pity, Janelle, after all you are part of media who (most often without proper research) instigate panic among readers.
“According to the media, my driver’s licence and passport details have been hacked” – you are not wrong by saying “according to media” as it is usually either one or the other. Companies selling services are obliged to collect 100 points of ID, and as a passport and driving licence both represent 70 points, you would have been required only to provide one of them, and add usually the Medicare card (which represents 40 points) to achieve 100 points.
“It was so long ago that I signed up, that I have no idea what personal details I had to provide to prove who I am” – documents have expiry dates and if it really was such a long time ago it is rather likely that the provided information is no longer valid, therefore you would not need to replace those documents. I suggest you save yourself some nerves and double check with the actual company (in this case Optus) what documents are stored on your account and is that information still valid.
Companies are legally obliged to keep certain information about their customers , they do not do if for fun.
I understand that you are thoroughly p…ed off, but perhaps you should be mainly at yourself, as you wrote this without checking the facts first.