Which of the following is NOT a factor that influences customer retention?

Advertising campaigns, while important for attracting new customers and raising brand awareness, do not directly influence customer retention in the same way that factors such as service quality, customer engagement, and product satisfaction do.

Service quality is crucial because customers are more likely to stay loyal to a company that provides excellent service, as it fosters trust and satisfaction. Customer engagement creates a stronger emotional connection and encourages repeat purchases, making customers feel valued and involved with the brand. Product satisfaction is essential because if customers are happy with a product, they are more likely to continue using it and recommending it to others.

In contrast, advertising campaigns primarily aim to gain new customers rather than focus on retaining existing ones. Therefore, while advertising plays a role in the overall marketing strategy, it is not a direct factor in retaining customers, making it the correct answer in this context.