I purchased 20 units of 2 pk of 3.0 64GB Kingston usb flash drives. When the order came, I learned by opening the package that only 15 units were shipped to me. I immediately sent an email to their customer service. No response. Tried a second time. Still nothing. Went to their online store to leave a message. In less than 36 hours I finally got a response and a refund for the remainder of the order not shipped. Thank you Colamco! Much appreciated. Will buy from them again in the near future!