The goal of customer service is to keep customers happy. Whereas the goal of PR is to establish and maintain the company’s good reputation. This is where PR and customer service intersect: Unhappy customers can smear a company’s reputation.

Customer service is the process of ensuring customer satisfaction with a product or service. Often, customer service 
takes place while performing a transaction for the customer, such as making a sale or returning an item. 

Customer service can take the form of an in-person interaction, a phone call, self-service systems, or by other means. And also an extremely important part of maintaining on going client relationships that are key to continuing revenue. For this
reason, many companies have worked hard to increase their customer satisfaction levels. Often there are many more people working behind the scenes at a company than there are customer service representatives, yet it is primarily the personnel that interact directly with customers that form customers' perceptions of the company as a whole. 

Public relations (PR) are a way for companies, organizations or people to enhance their reputations. 
This task typically is performed by public relations professionals or PR firms on behalf of their clients. 
PR usually involves communicating with the media and through the media to present the clients in the most favourable way possible. 
It also often involves cooperative efforts with other people and organizations to create good will within the community and enhance the client's image.