Extremely bad service

I was called by their call center on the 13th of November 2023 to book my vehicle for service and I chose the date of the 12th of December 2023. When I arrived on the day, I was told that my car was not booked for service- their call center did not verify the booking with them. On the same day the call center called and scheduled another booking for the 15th of December 2023. When I got there I was sent back because they could not get authorization due to it being a public holiday. Do the two departments within the same organization not communicate and know their process...I have never felt so exasperated by a service provider who keeps wasting my time and fuel