Customer service surveys are akin to customer satisfaction surveys, but focus in detail on the actual customer service that was received, the process involved in receiving that service and an evaluation of the participants in the service process.

General Measures That Are Part Of Customer Service Surveys
Customer Service Evaluation, Customer Feedback
Reflect on last service experience
Overall, how satisfied were you with your overall service experience?
How would you evaluate the service experience (compared to other industries or compared to others within the industry. This evaluation may be based on a set of standard service attributes such as the SERVQUAL survey)

Tangibles : appearance of physical facilities, equipment, personnel, and communication materials;

Reliability : ability to perform the promised service dependably and accurately;

Responsiveness : willingness to help customers and provide prompt service;

Assurance : knowledge and courtesy of employees and their ability to convey trust and confidence;

Empathy : the caring, individualized attention the firm provides its customers.

Ask for comments about what was superior about the service
Ask for comments about what was unsatisfactory about the service

Survey Process Evaluation
Evaluation of problem resolution PROCESS
Ask for comments about what made the PROCESS superior
Ask for comments about what made the PROCESS unsatisfactory

Evaluation of Responsiveness
Evaluation of product value
Courtesy
Speed
Knowledge
Timely in service and customer support
Easiness of refund policy and purchase process
Waiting time

Evaluation of Assurance
Ability to answer question / solve problem
Efficient use of time
Transferred to someone who answered question

Overall Satisfaction
Who would you use if current company was not available
What percentage of your purchases are made with [COMPANY]?
How much of the product have you used in the last year?
Overall, how satisfied are you with the product?
If the rating is a 4 or lower, why did you feel that way?
How likely are you to switch to a new company (if bad experience, how can we improve the process?)
How can we improve the current customer service process?
Is there anything else you'd like to tell us either about your experience with the product or your actual usage experience?  
How can we best contact you for future evaluations about your experiences with our product?