Alternator

I went to Young's Garage in Worcester, MA on 8/6/15, for my first time. I spoke to Jim about having my car looked at for a starting problem. I was told there was a $45 charge to diagnose the problem. When he got back to me later that day he told me it was the alternator and it would be $375 total. I asked him why it was so expensive and he told me it was because the part was hard to get to. He said it was a big job so therefore most of the charge would be for labor. He told me if I dropped my car off the next morning it would be done later that day. I dropped the car off at 8am and Jim told me he would call me when the car was done. I waited until 3:00 to call and check on the progress. Jim told me it wasn't ready and it would be done for 5:00. I went to pick up the car and he handed me a bill for $330 after I already paid the initial $45 charge. The next day I called to question about the $45 charge, because the part and labor were through his shop. All the garages I have gone to take the initial diagnostics charge off if you buy the part and have the labor done at their shop. I wanted to let him know I was dissatisfied with the price all together and the amount of time it took between both days. Because of this experience, which was my first here, I will never go to this garage again.