I had previously rented a car at Washington Dulles Airport and experienced Dollar's aggressive upselling. So this time, I deliberately avoided Dollar and chose Thrifty, not knowing they are the same company. The attendant I encountered this time was even worse than the last one. Initially, the paperwork was smooth, but then they started pushing all sorts of insurance and toll passes, asking me to pay an additional 300 dollars, almost the cost of my 10-day rental. I repeatedly said I didn't need them, but he kept pushing. A Chinese friend behind me in line couldn't stand it anymore and told him I had already bought the necessary insurance when booking, only then did he stop. However, his attitude changed, and he angrily tossed the documents to me, directing me to the C-class car area. When I got to the parking lot, I found their so-called C-class cars were small vehicles like Hyundai Accents, whereas I had booked a compact car. I went back to negotiate, but he insisted that the car I booked was of that class. I called QEEQ customer service for help, but they couldn't resolve it either. As it was getting late, I had no option but to drive away in frustration. Later, I noticed the rental agreement clearly stated the car class as 'B', it felt like deliberate retaliation! This was the worst of all my international car rental experiences and I have never encountered such a malicious person abroad!