Many DSG/auto gearbox's have a stickers or are stated as 'sealed for life'. This does not mean that the oil does not degrade and or need changing, just that in your case VW does not want the dealer to do so.
Two reasons for this, it means on paper the total service cost for the car will look lower. Gearbox oil is cleaned by a magnets within the gearbox and therefore needs carefully changing, else you can brake the box.
The answer to your question is the VW UK as alway does not want to do anything that costs money. The oil can be changed and may well not be that easy as is the way with seal for life gearboxes. It's not the first time ppl have had issue with the gearbox oil and VW have not let on that there is a solution that they should be fix free of charge.
VW will tell nothing needs doing and there is nothing wrong with the car until thet are blue in the face. It's a game the car companys play with us, I guess no one has told them about the internet LOL
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