I have been downgraded from LDAR (Luxury Sedan, BMW 530) to UDAR (Premium sedan, Mercedes E class) on an upcoming booking (with no notice of course).

There are no luxury sedans available for my location with the next one up being a BMW 7 series (Extraordinary category, XDDR). I am considering requesting an upgrade to a Luxury (VW Touraeg)/Luxury elite SUV (BMW X5) through customer service so I do not have to negotiate that upon arrival, but not sure if realistic or if they will fob me off with a small refund.