After 3 weeks of waiting to have the car serviced ...

After 3 weeks of waiting to have the car serviced because it couldn't be earlier because for work reasons I need a replacement car, when I arrive at the workshop today the first thing they tell me is that they don't have a replacement car. I told him that they sent me a message yesterday reminding me of the appointment and if they could not tell me about the car?
In the end, no car, no review and the answer is that we are who we are.
But the only one who has lost hours of work and time has been a server and again waiting to be called.
Of course, when buying the vehicle there were no problems at all, very unhappy in general with the after-sales service of the Brand.