even before they know what you are selling to them. they might be confusing your product for a disappointing one. they will resist the moment they see you approaching; they will stop you from where they are or point out a mistake they view on you. they notice everything about you and shift from the issue at hand. you might not know why they are complaining but asking what the problem could have been could change their mind in an instant.
you could be an expert and one that knows about your product more than anyone does. you know very well that there is a customer who believes they know about 