Sorry - I've only just seen this thread.
I've had the same problem on my tourer - the switch just stopped working completely one day.
I removed the silver plinth from the car but in trying to dismantle it for testing I managed to knacker it so I just replaced it with one from a donor car.
It's a relatively easy part to replace, except you'll need a security Torx bit to unscrew the mounting screws, which come out from the outside.
Good luck!
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