Some UPS customers say the shipping service is applying the wrong tariff to US-bound shipments . In some cases, the customers said UPS sent them bills that tariff their shipments at up to 200% — the US duty rate for aluminum from Russia, and one of the highest tariffs that American customs officials can charge. The problem: The customers said their shipments don't contain that metal, and getting a hold of someone at UPS to contest the charge is laborious, if possible at all. Business Insider