Looks like there has been really bad reviews from franchise locations. I wouldn't expect any non US or Euro Sixt to really care about status or even treating you right. CS probably couldn't do anything either because they are franchisees and have little control.

It just looks like franchised locations are worse overall in many ways.. though Sixt at MCO once asked for proof of collision coverage before letting me decline LDW so that was kind of annoying too.