Get it back to the dealer that sold it to you. The seller has the responsibility to fix this free of charge in the first 30 days of sale. As you're still entitled to a full refund within that time
Get this into Audi asap as it should be covered under the warranty which will be expiring this year as your car is a 2021 model.
Unfortunately Audi never learn and water ingress damaging sensitive computers etc has been common issues on Audi's over the last 20 years. I know as my old A6 C5 has suffered from it.