It’s frustrating when Seller Support is not supportive! So I feel your pain. My first thought is to create a PDF that includes all details on one documents (a 1-2 page PDF document) and resend it and clearly add direction to where your proof of NAME, proof of Business entity, Proof fo ADDRESS is and also Credit card information (your credit card details are needed for any charges that need to be made if you don’t have sufficient disbursements in your SC account, but it must allow Australian transaction to be approved).
Have you tried to call them? I always find a phone call is much more productive than getting caught in the automated email loop.
Have a go at the PDF and try and call and add the PDF to the ticket once you are on a call.
Let us know if it helps cut through the email loop.