If not, customers could ask for a refund for their faulty goods.

如果没有，客户可以要求退还有缺陷的商品。

Before writing a letter of complaint, learners think about a situation when they have complained about faulty goods or bad service or have felt like complaining, and tell a partner.

在写一封投诉信之前，学习者先想一想当他们抱怨有问题的商品或不好的服务或有抱怨的感觉时的情形，然后告诉同伴。