at my job..not deliberately..but a customer was upset..she gave me a big speech with her order (and the store was very loud and busy and I was trying to keep an eye on other things too - not that that is an excuse) - and I genuinely just didn't pick up on part of what she said and so got something wrong (which I fixed immediately)..and she was upset and said that she felt like she was invisible (ie: that I wasn't listening to her)...I felt really awful for the rest of my shift, and obviously I still feel awful right now. I try really hard to be consistently kind and helpful but obviously I just blew it this time, and badly. Tell me your experiences of when you failed at customer service.