Customer frustration due to unfair and poor supplier service

My vehicle (tiguan) was taken in for repairs yesterday as warranty claim. To my surprise vw sa is not willing to give me a courtesy car during the period of the repairs of which we do not know how long will it be away. I tried to speak to the staff to escalate or be reffered to a more senior manager but they refused. Imagin the inconvenience, now I must hire a car because of a mechanical failure of which the car was bought brand new in 2016. This is frustrating as the was towed yesterday but still is not at a dealership for repairs to commence. I was told that if small dealerships doesn't have courtesy car it's not thier problem but customers should sort themselves out while they wait for thier cars to be fixed.