I made an appointment for a tune-up of an inexpens...

I made an appointment for a tune-up of an inexpensive mountain bike I have. I left a message because the recording said business was exponential, and they added an additional crew to keep up with all the customers. I received a call back the next day and was able to drop off my bike a couple of days later. The tune-up, she said, would be $95. A friend had told me she got a tune-up elsewhere for $75, so this was at least 20 dollars more than I expected, but this place is nearby so I said okay. When I dropped it off, the young man (in his teens I think) asked if there was anything in particular they should work on. He took some notes about how the gears were slipping a bit and brakes needed to be adjusted, which I figured was pretty standard. When I picked up the bike a few days later, I got a simple receipt from the regiater, and when I asked what had been done and what their policy was if I noticed anything needed further attention, he had no idea and zero interest in finding out. The good news is that the bike is working well, so I know they did something, but I still wonder, what exactly did the tune-up include for $95? Did they do anything beyond adjust the gears and brakes? What's this cost based on? Is it $95 for everyone? If I'd needed more work done on it, would it still be $95, in which case I was an "easy" customer for them? These are the questions I'm left with that will prevent me from going there again. Even though I live so close to this place, the way they conduct business felt exploitative.