I would first tell your husbands parents to have no dealings with the debt collection people. It's between you and debt collectors. Your parents are under no obligation to have any dealings with that crowd. If they continue to harass them, report them. If they haven't already done so, ensure they don't give the debt collectors your address in Aussie. Secondly, as previously mentioned, ignore the debt collectors. For a sum as small as you mentioned, it's simply not worth it for them to chase you for it. They will simply write it off. If you stay in Aussie you'll be fine. If you come back home you may have problems as I'm sure this will be on your credit report but if coming home isn't on the cards, who cares.