Businesses won't grow without innovation, what kind of innovation do we need in the customer service field?

Two points here: Business already in place: Many times businesses know what needs to be done to improve services but unfortunately some hope that customers won't notice gaps in service, hope that they won't complain and get irritated when a customer does actually take a step to improve service.
People: Down to the calibre of people employed in the roles.
Customer Service industry unfortunately gets a bad reputation due to how enquiries are handled, language communication breakdown and unfortunately extreme demands of some customers.
You can buy all the fancy equipment and tools that you want for business and dress it up but it will still come down to the standard care a customer receives.
World wide different emphasis paid on the training or not of workers in this field, but it would be a worthwhile investment because if many countries took away the service industry, many societies would collapse.

Diversity in consumer tastes.

Business grow with Change....Get new changes in the current procedures or norms followed.
Any innovation in a Customer Service field should always focus on getting query resolved without customers involvement

sure we have to develop our product and to have new customer maintain as a good after sales service and to ask customers what they purspose as a new service or product to have a good feedback and different new idea 

One of the best ways is to ask your customers about their feedback and what new things they like to see in order to continue being satisfied with your services.

Customer Service is for ever evolving.
No matter how much effort you put in , you could always do better.
We need better response time.
Its not the product that makes the customer happy , but the service he gets .
Be innovative and do something special for your customer, need not be materialistic .
A simple letter or call inquiring about our services and his opinion would make him feel special.

patience, empathy