If you don't get a response within about 10 days, call the representative to let them know you're waiting for a response, and send another letter by certified mail with return receipt requested.
如果你在10天内没有得到答复，给代表打电话告诉他们你在等答复，寄另外一封有需求收据的保证邮件。
Certified mail protocol is fair exchange of a message m for a receipt.
认证邮件协议，指一个发送方要将消息M与收方收到的证据进行交换的协议。
Here is your change. Please wait for your receipt of the registered mail.
这是您的零钱，请等一下您的挂号收据。
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