How can freelancers turn clients complaints to marketing opportunities?

[Btaliat]

Freelancers should always watch out for complaints from the clients, whether for him or the other competitors. All these complaints can be turned to a way of marketing himself. He may promise to do something that clients complaints about. Freelancers need to be smart in his moves for him to take advantage of freelancing services. Can you suggest ways by which freelancers can do this perfectly? Share them in this comment section below for others to know.