Trip Canceled

I had a reservation to pick up the car at 3 PM. I called the rental company at 9 AM to confirm if there were any issues with the pick-up. To my surprise, they said there were no cars available and that my reservation had been canceled! This was shocking as all my plans, including hotel and flight tickets, were already booked, and I had six pieces of luggage with three people. It would have been impossible to move around without a car in a foreign country. Fortunately, the customer service at the rental platform was very responsible and quickly arranged another car. However, instead of the Mercedes C-Class I had paid for, I got a Mercedes A-Class. Even though they promised a refund for the difference, driving a smaller car with a lot of luggage for four days was quite inconvenient. I can only describe the car rental company HERTZ as 'terrible,' and I advise everyone to be cautious when renting from HERTZ in the future.