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You must sue in Zurich as international law says with a swiss attorney
It will be very interesting for you, in order to let the chain now, in US, your problems with them, because chains ussally take care about their reputation all worl arround
So, contract a swiss attorney, your consulate in Zurich will provide with a list ot they, and send a letter to the head oficces in US to let them know
I will be here if needed