Mututal respect implies a two-way compromise rather than a demand on my part for a percentage off. To me there is a huge difference between retail where a person buys a product off a shelf, and service where a person has to wait for a part before a job can be completed. Allowances have to be made for unexpected shipping delays. I do agree that a call should be made, and as Raiyn said if it's early, if it's late a call should be made. I also know the bike shop where I have mine serviced, the place is huge, has many mechanics and many bikes because for they do a good job and have a good reputation. I take into account the fact if I stop in on a ride, they make adjustments post-haste without any delay, no matter how busy they are or how many bikes they have in the stands in the shop. If I have to leave my bike, I know that they will be taking care of the walk-ins as a priority which I as a customer find much more important as a customer, and as a customer I know is their priority and expect before leaving my bike that they will take care of walk-ins. I also know if I ask for a spoke, or a cap for the end of a cable, they walk in back, they hand me one and they say no charge. And having been in retail myself, I know a phoney kiss off, where you complain, get a discount and are the topic of discussion by employees after you leave, I know employees will warn each other when they see you coming, and I know it will appear as though you are getting the same service as before, but you will have lost their respect.

In a mutual respect situation they cut me some slack, I cut them some slack. I don't have to worry about them saying they are out of spokes or cable caps because I pissed them off the last time I was there over something that was for the most part out of their control. I concede to your they should have called, but I'm not so sure your technique is a mutual respect.