What can service providers do to prevent having dissatisfied customers? what do you do

This will depend to some extent on the nature of the
service that your firm is providing.  However, the most obvious way to prevent your
firm's customers from being dissatisfied is to provide them with a high-quality service
at a good price.  Customer dissatisfaction is often related to the quality of the
service and to its price.

Another thing that can be done in
all types of service industries is to provide a pleasant atmosphere and to make the
customers feel good about the people with whom they are dealing.  Customers who feel
like they were treated well and who felt that their overall experience was pleasant are
less likely to be dissatisfied, even if the service provided is not 100%
perfect.

So, the best ways to ensure customer satisfaction
are to provide a good service, at a good price, in a friendly
environment.