How can I collect the balance when I only pay the down payment for business transactions?

At this stage, e-mail is sent to the customer to inform the status of the business transaction and express concern. How have you been recently? I haven't heard from you for a long time

Trade is a general term for buying, selling or trading, which usually refers to all exchange activities or behaviors with money as the medium. Its scope of activities includes not only the commodity exchange activities engaged by merchants, but also the commodity trading activities organized by commodity producers or others; Not only domestic trade, but also international trade between countries.

Balance: (1) remaining or remaining money; (2) refers to other provisions.