To speak about sales, you need the appropriate vocabulary.
After-sales service - service provided after a customer has paid for and received a product or service;
Buyer - someone who buys something;
Sales - the number of items sold;
Close a deal - to make a successful business arrangement with someone;
Cold call - the activity of calling or visiting a possible customer to try to sell them something without being asked by the customer to do so;
Customer - a person or organization that buys goods or services from a shop or business;
Deal - an arrangement or an agreement, especially in business;
Discount - a reduction in price;
Warranty - a written promise made by a company to change or repair one of its products if it has a fault;
In bulk - in large amounts;
Lead - to show someone where to go, usually by taking them to a place or by going in front of them;
Objection - when someone says that they do not like or approve of something or someone;
Prospect - the idea of something that will happen in the future;
Sales representative - someone who travels to different places trying to persuade people to buy their company's products or services;
Retail - when products are sold to customers from shops;
Wholesale - relating to products which are sold in large amounts, usually at a cheaper price.
We closed a deal with a major supermarket.
Mrs Wilson is one of our regular customers.
This shop has wholesale prices.