So i ordered frameset TanTan x38, but because direct delivery cost as much as frame itself i tried to deliver it using forwarder with much cheaper delivery price, so seller can't refund me the cost of the frameset. So the problem is, tracking says that parcel is arrived at forwarder warehouse, but they couldn't find it and ask for the stamp or sign on the invoice, but because of language barrier i asked several Chinese people, but they couldn't understand what i need and they say that in China you don't sign package, they just deliver it and this is it, but my forwarder says that they only accept this kind of document, and after i will give them it, they will start further investigation.
TLTR: if someone have Chinese friend who can contact courier and ask for this document, it would be extremely helpful.