I prepaid the full amount when I booked through Zuzuche, but when I arrived at the store, the staff said I hadn't paid. The money was taken by Zuzuche but not given to the car rental company! Using the lack of prepayment as an excuse, they refused to give me the car I originally reserved and downgraded it to an Audi A5. I couldn't reach Zuzuche for help. After arguing at the store for 2 hours, the staff reluctantly gave us a Mercedes E-Class (which should have similar space as an Audi A6). It wasted a lot of our time and ruined our mood.