I had already paid the airport pick-up fee, but even after the rental company's customer service and the airport staff communicated, they still claimed they couldn't see it in the system and charged me a high airport pick-up fee again. They told me that C-marked cars couldn't enter the city center and that if a camera caught me, I would have to pay a hefty fine. They suggested I switch to an Echo-marked car for an additional cost; however, in reality, C-marked cars can enter the designated core areas of the city as long as the car is parked in an underground garage and a photo of the parking ticket is kept for reference. This is completely different from what the rental company staff said. They also threatened that the insurance I bought through the rental platform was useless and that they wouldn't help if anything happened, exaggerating to intimidate me. This was the worst rental car company and staff I encountered in Spain. In the end, I insisted on choosing directly through the rental platform, and the staff looked very displeased and did not give me the car model I booked; they only provided a Peugeot 308 and would not respond to my questions anymore.