My dad had to persevere until he found a more senior person (with a good understanding of English) who finally understood his need for a TIN and processed it
Again I guess it is easier for some to just say ‘no need’ and send you on your way
I have no idea if it will be that quick Try and search recent threads but it seems that the sooner the booked flight to Thailand is the quicker the application is processed
Up to you but be aware you should stay in Australia while waiting for the visa