Recently reserved an 4 series "or similar" (think it is RTAR) at LAX. Upon arrival was told they had no RTAR inventory and offered me a mustang


Ultimately ended up with a 3 series with 20K+ miles on it at a "discount" but honestly the rate looked worse than what I could've gotten when I booked. What is Sixt's official procedure here? Seems like inventory is not tightly controlled vs. reservations so what is a customer to do?