I was told that the when the problem originally came to light that they were just replacing the old waterpump with a new but same model pump and after about 1000kms the problem re-occured. What (supposedly) is happening now is that there is a different/new waterpump that they have been told to use to replace the old one.
I am hoping that it does fix the problem because as you say it is annoying.. but more so that you can actually hear is outside the car as well.
Maybe give VW wangara a call and ask if there is a solution to the problem now???