Location: SVQ
Status: Platinum
Booked: IDAR
Received: IDAR BMW 118d

Asked about Platinum upgrade. Was told next category up would be SDMR and would be an Audi A3 Saloon, but would be an extra 18.15 euros per day. Tried to argue over platinum one category upgrade and was told could only choose a car within my booked class.
Have since complained to Sixt customer services and received the following reply "We would like to inform you that the Upgrade depends on the availability of the office, and the office decides whether to give the Upgrade for free or for a fee depending on how many cars they have left. Your Platinum Card entitles you to receive an Upgrade, but as stated before, it always depends on the availability. We are sorry that this time your could not receive a free upgrade."