Has your team attended mandatory training to learn how to smile at the customer and be polite and friendly? Do you persist in having disgruntled customers despite your team's best efforts to smile brightly? Perhaps the problem lies in your service delivery methods as opposed to the level of enthusiasm with which services are delivered. Here is a technique for examining your team's service delivery practices.
Once the team has isolated points in the cycle where improvement is needed, create service improvement plans that tell specifically what will be done to improve service at each point identified. Be sure to structure these activities so that they are listed in sequential order, and are linked to a specific timeline.