You did not pay for a Luxury Car, but for a private transfer by standard Class vehicle. In the product description there Is not any reference to Luxury vehicles.
Despite this, we only use Mercedes vehicles, except for the emergency vehicle, which is a Volkswagen Passat station wagon, a vehicle that falls into the standard category, which is used in the event of a breakdown of the main vehicles.
So you have nothing to complain about!
I advice you to read Better a product description before buying It!
Regards
Taxi Catania NCC