I treat customer service reps with patience, friendliness, and a little bit of awkward humor. Had to activate a phone awhile back and was struggling. Had an issue with one of the steps just not working. It was due to their poorly worded online guide. Customer rep confirmed that this issue does happen, etc etc. Told her “It’s okay. Small issue, we’ll figure it out. You’re not the one responsible, though I really appreciate your help.”
Rep, "Oh no you’ve been really patient and kind! I am happy to help "
And she did help. Probably more than she needed to since she wasn’t in the service department at all. I had been transferred to Sales without realizing. So huge props to her on that one.