We bought 8, 000pcs USBs from Shenzhen Zhongwei Technology Shared Limited with address at Building South, Xue Xiang Industrial Park, Long Gang District, Shenzhen 518129 Shenzhen Tel: +[protected] and website http://www.usb-promotions.com/ last June 20, 2016. They showed their Alibaba credentials and other information to appear legit. Unfortunately, 99% of the USBs are defective upon receipt on June 22, 2016. Company representative and owners refuse to neither talk nor fix the issue.