It's about the small things

This is somewhat related to my recent posts.
I recently went to a new place to get my oil change. They informed me when I called that they top off all fluids as well as change oil and filter.

Long story short, I got my car back and looked at the windshield washer fluid was still at the same level it was when I dropped it off. (empty)

I realize it's a small thing and probably only costs 85 cents. However, as a consumer, I can see they didn't fill my fluid up, what else, that was more complicated didn't they do?
Yes, I called them and told them I was disappointed. They told me I could come back and get it filled up. I won't be doing that, more of my time and money to go back there to let them fix and issue that they should have done right away. They did not even apologize, just said I could come back in to fill it up. So instead of "sticking" it to them and making them put that 85 cents of fluid in, I am not going to give them my business (two vehicles) and I will probably not speak highly of them when talking to my family and friends. (potential customers)

Why do you care? Are you doing the small things that make a difference with your customers. When people get an oil change they expect to get their oil changed, however they don't expect to get their car vacuumed, or their dash wiped off. What would that cost the buisness to do that? However what kind of investment is that in that customers probability of returning? It's the small things that will keep you in the customers mind next time they or their friends need your services. Also if you do something wrong, say I am sorry, it is my fault, I screwed up. People don't take blame anymore, they simply pass it.