Listening to your customers merely means you are paying attention to them in order to hear what they have to say. That much they expect of you.
Hearing them goes much deeper where you perceive, discern, apprehend, and even comprehend.
You can applaud yourself for all of the ways you listen to your customers, but if you never hear what they are telling you, it only creates frustration.
Focus on hearing them, on discerning what they are telling you, on understanding their wants that they are trying to convey. If you can serve their wants, you can delight them.