"usa-angel.com" has built automated systems for buying the postage with comparative and competitive carrier service. We ship the product by paying the shipping label from our system. Our shipping manager can’t ship the product until purchase the shipping label. Sometimes the carrier or shipper made mistake. In these circumstances, we are requesting the customer to receive or collect the package from the carrier by paying the postage due or insufficient postage due and let us know or send by e-mail or text us the invoice. We will refund you the money that you paid for the postage due or insufficient postage. This is our responsibility that how early, easily, and safely deliver the product to our customers. We are sorry and apologize for any inconvenience. This is our pleasure to serve you. We appreciate your passion.