I would not trust the VW guy as he ain't a ac expert he is a car expert.

Compressors don't just die for no reason, if it did die it would be due to loss of oil through leaky seal which can be caused by you not using ac in cold weather.

You could of lost your gas which could be a duff seal again.

Ac is a thing to me that needs lots of maintance but i work with far larger units.

Also VW will charge silly money for a compressor i would be very surprised if you could not get it a compressor from another source.