Lack of customer centricity

My car was booked on 4th Nov at 8am. I was told to pick up the car in the afternoon because it wasn't attend to due backlog and it will be attend to the following day. The next day my car was picked and in the afternoon I was told the same story as yesterday. After I complained and my issue was escalated. My car was tested for less than an hour and told it is safe to drive because the issue is not critical but a test report couldn't be produced. After raising my concerns and stating the fact that I will be driving out of town for a week the branch didn't care to organise me a loan car. I am really disappointed because the manager told me he has happy customers.does that mean he doesn't care about new ones since it was my first time there. I was driving a Fiat before and I was always provided a loan car whenever my car is required to stay overnight. I am really disappointed as my needs as a customer were not satisfied. For a brand like mercedes benz to neglect their customers or consider only a certain few it is ridiculous.