VW dealer gives up even quicker and sends the owners to my boys garage. he tells them to p off and go back to VW experts. Sometimes he might spend a few minutes and fix it.
It is strange that owners go to a main dealer who is just basically putting in oil and filters and ask them to fix a fault. Ofteen, they have no idea how to fix them.
Nissan is a prime example when they were unable to diagnose a duff battery on my car. After 5 visits, they asked me to call the AA who fixed it in 30 minutes.