I tried but bank sided with them, since they don't want to get into legal issues. Booking.com claims the reservation is a "non refundable time limited special offer" in order to rip you off. This is anti consumer behaviour that should just be illegal. Just avoid them at all costs. Neither Booking.com nor Sixt would resolve the issue. I called support, they just fed me social engineering mumbo jumbo.
Your bank sided with the merchant? Normally they would at least try to argue the case and maybe lose it if the merchant's bank has better arguments or evidence, but straight up refusing to try? I'd just drop the bank and get a one that knows what the hell they are doing.
