I Applied for Australian Tourist Visa and paid the fee and while waiting to get an approval, i learned that I can just do Transit visa since I'm only staying there for 2.5 days from a cruise trip. I got both approval for tourist and transit and then I called to cancel my tourist before my trip and the fee returned to my credit card. I am thinking i can use the transit visa. After 3months, Australian visa emailed me that I need to repay them back for the tourist visa that i used because they said it was automatically ceased my transit since they approved my tourist.
My question is, can i just ignore this and not pay it or am I going to have trouble here in the US where I reside? They said if i didn't pay, it will go to debtors section in their National Headquarters and will result having a debt to the commonwealth. Waht will happen if I don't and im not planning to go back there.