Hi,
I’m not sure especially when it comes to international situations but I’m thinking that here in the US if a mistake is made it is on the one who made the mistake.
Even if the above is wrong … I think (certainly morally) and likely legally that any problem such as mentioned here you simply follow the money.
To whom was the money paid?
If you received either both payments or just one … then its to your credit (morally) if not benefit (legally) to simply pay back the $5k. Or if you received both payments then payback one since they actually owed the other.
though it hasn’t always served me well … I’ve always taken the stand of what I considered to be right. it seldom works against you to be morally right though as I’ve found out the hard way that isn’t 100% full-proof from a legal standpoint. Despite that fact I sleep well at night … or whenever it is I choose to sleep and that is a lot IMHO.
since its an issue crossing country boundries I suspect its going to be hard thing for the over-payer to hold anyone … especially anyone not having received the extra payment …. as being legally accountable.
though probably not worth it … there’s my 2 cents.