reminds me of the French Avis bug, where all Prestige cars were massively discounted for rentals of 5 days or more...missed out on the 6-series convertible at €166 for 5 days, ended up with 3 bookings: Audi A7, Peugeot RCZ, Posche 911 convertible, for a total of less than 900€ for 5 days.
In the end, when I arrived at the counter, all bookings were valid but cars had not been readied yet...I ended up cancelling 2 of them and hopping on a brand new S350 for my wedding! I put 1250km on it for a grand total of €300 for 5 rental days