I applied for an Australian tourist visa and paid the fee. While waiting for a permit, I learned that I can only apply for a transit visa, as I only stay here for 2.5 days from a cruise. I received both permission for tourists and transit, and then called to cancel my tourist before my trip, and the fee was refunded to my credit card. I think I can use the transit visa. After 3 months I was sent an australian visa by e-mail that I have to pay back for the tourist visa I used because they said that my transit was stopped automatically because they had agreed to my tourist.
My question is, can I just ignore that and not pay, or will I get in trouble here in the US where I live? They said if I did not pay, it would go to the debtor department at their national headquarters and have a debt to the Commonwealth. What happens if I do not do it and do not intend to return there?