I sympathise with you completely.
I had a call from the Audi dealer on Thursday, to advise me that the new alternator has arrived, and that they will fit the part and the vehicle will undergo extensive road testing.
I asked the service advisor if she had heard from Audi UK because I have rejected the vehicle due to it not being fit for purpose and I have lost confidence in the vehicle and brand.... obviously from her response she had not.
I called Audi UK to ask for an update and was told as this is now with the Dispute Reolution team, it will take 6 to 8 weeks for a conclusion. Audi UK and the dealer need to start talking.
I have been provided with courtesy cars ...... all Mercedes. They have not been like for like replacements but at least it is something.
The funny thing that happened in the week, was a call from the local Audi dealer trying to sell us a new car as a replacement for my partner's E-Tron. This is the same dealer who has my car. A bit infuriating but amusing.
Will keep you posted.