Originally Posted by
kwoj
Fraud is not possible because they check your status with the issuer of your hotel/airline card (at least in my case).
Hotline told me that all cards remain valid, and that they automatically send you a new one if your old expires no matter how much you rented in the past.
Yes, it should be that way, but there were several reports here on FT how to bypass the normal process. Much likely Sixt closed the loophole.