Update of the day: After the last complain ticket, I finally received a good answer from Sennheiser Germany (yes, finally). They are sorry for what happened. They are still investigating why I got a return request with a shipment to the USA. Since I am in Europe, the package should be returned to Germany warehouse. On a separate email Sennheiser sent the return instructions and a PDF file in attachment with the UPS courier label. I already shipped the package and after the package reaches the Sennheiser Warehouse, I should receive the refund in 5-7 days. It is not possible to receive a new Sennheiser IE800S as a replacement. Instead, I have to place a new order. I will update you, hoping that everything goes smooth as it should be. I will place the new order on the same day in which I will get money back. I am a little bit disappointed for what happended, but enough satisfied of the IE800S.