I think I read on some VW fourm that you can tug on the short cable by removing the right rear tailight assembly---but of course you don't want to be doing this over and over again. Another forum said that merely removing an inside access panel might work if you are agile with your arms and fingers to reach in there. And another forum says that removing the inner fender liner might help.
The car needs to go to the repair shop--could be the cable or could be the release motor.
Why they don't make this easier...beats me.