Due to traffic delays from Quebec to Montreal, I arrived at the Hertz rental company at 16:00, but the doors were locked. There was a sign indicating that the working hours on Saturday, May 21st were until 15:00. I went back to Hertz the next morning (Sunday) at 8:30, and the counter staff informed me that my reservation was canceled because I did not pick up the car at the agreed time. I explained that I had fully prepaid for three days, and the reservation should still be valid within those three days, but they refused and told me to contact the rental platform for any issues. Frustrated, I had no choice but to go to AVIS and rent another SUV, paying again.