After booking with Sixt a bmw Z4 convertible we didnt receive the confirmation email. For this I called Sixt customer service. Here was confirmed that the car would be available for us upon arrival at pick up location schiphol.
When we arrived at the pick up location the car was not available. They offered another convertible car. We agreed on this. But finally Sixt could only offer this if we paid €150 extra. This became above our budget.
I felt misled twice by sixt.