If a company from another country wants to collect a legitimate bill from you then they will need to hire a US collections attorney to do so. If they do, then the US collections laws would go into affect. If you have committed fraud in your country by failing to pay your bills and those companies choose to go after you here in the US then the US can participate in any criminal action as far as having you arrested and extradited (just giving you the worst case scenario). If you had every intention of paying the bills after you left you should go ahead and do that and if you hadn't you can wait and see if the companies take any action here in the US (FYI many US collection attorneys accept the work on a fee recovery basis - meaning if they take the bill to collect they keep a high percentage of what they collect - therefor the US collection attorneys have an incentive to go after the money in any way possible).
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