Thanks for the replies. I was hoping for a simple solution.
Guess I better take it to the dealer. Hope they do not damage anything (scratch something)..... or wash the car.
I have talked to the dealership. They will look at my car on Tuesday next week.
It's a common issue with the A3... Had this on all the cars we have owned. All Audi will do will wipe the door and seal with a silicon cleaner which will stop the creaking for a few months but it will return. You'll find it will do it more in warmer weather rather than colder.
You will find the noise will stop if you lower the window too...