Haval Cape Gate-Bad service

We had such a bad experience with the workshop this morning. We've been calling them and trying to schedule a service for our car for the past 2 and a half months, due to parts. We finally got an appointment for 11 March and we were told the parts have arrived. This morning after being (what I assume is over booked) they have me drop the car, do inspection, book my Uber to get home. Only to arrive home 20min later to be told that I must come fetch the car, there's a part that hasn't arrived and the car cannot be serviced. It was very unprofessional, especially because there was another car also for a major service who was not told they needed to reschedule. It is disheartening because now I need to reschedule my Uber for work to go back to Haval to get my car. It is unprofessional and they don't understand the financial implications they cause, without a sincere apology for "their error".