2016 Audi A4 Steering

We live in Montana where it gets very cold on a regular basis while driving our Audi the steering wheel ceased to function and would not allow us to control the vehicle this occurred three times. A warning on the dash came up that said steering malfunction stopped vehicle but it was very scary and intimidating to know that your steering wheel could quit at any time we got stranded and took it to a dealer and they said that the steering rack computer had failed and could not get the part for at least a month since they had so many of these vehicles having the exact same issue in the United States the dealership stated that the other three dealers locally to them all were waiting on the same exact part for the same problem they charge us $6,000 to repair it I would think that if so many of the same vehicles are having the same problems that there's no parts available in the country that it should be a recall and the manufacturer should be responsible for the issue what can we do?

Rubber boot around the electronic steering rack wore out after only 30k miles. This has caused no warning lights, and very dangerous behaviour from the steering mechanisms. To include the steering wheel locking up mid turn, and the steering wheel "stuttering" due to the electronic motor failing.