It already happened at least 4-5 times where UPS returns my parcels with no explanation. According to the tracking numbers, some information were missing, but instead of contacting and telling me what was missing they returned the packages. When I tracked the parcels though, it showed that they "made" several attempts to contact me, which is a complete lie. They never contacted me! Recently, one of my suppliers tried to ship out a parcel with UPS and once again they returned it to sender because according to the tracking number the consignee address wasn't correct but it wasn't true either. I checked the address and it was correct. And every time, I contact the call center they can't even tell me what document is missing. It's simple a waste of time and money to deal with them. I rather use FedEx or DHL