Neat app!
So this is specifically trying to measure a customer's satisfaction with your customer service (not their satisfaction with a specific product or the sales process for example)? If you were trying to measure those other things, I wonder how this tool would handle it? And how do you make sure the results are focused on the customer service (rather than the other stuff)?
In my experience with measuring customer satisfaction, folks can be very happy with the quality of service they receive but absolutely loathe the product or the process they had to go through to purchase it and then ultimately give you a low score on "Would you recommend this company?"