Surprise a Customer with Great Service

Have you been surprised by great customer service ?  Well this is what I used to do in my old career. A customer would call our call center with a very simple request. I would handle the request and the customer would assume we are done. Well, I would ask the customer if they have a moment. I would tell them I have reviewed their account and will give them a free month of service. This worked well because the customer was not expecting this and creates a smiling customer. The basic idea is; exceed customer expectations. This will create many smiling customers.