This is quite a common problem with A3/S3's... usually it's the plastic guides that go. These little buggars are stuck to each side of the glass, and are responsible for taking the window up/downwards.
Had mine replaced pretty unexpensively... all you have to find is someone who is willing to open your door and replace them. Garages generally won't charge you anything for the guides (they probably cost 50p each!), but will surely do for the service, which usually lasts 30-40 minutes.
My S3 is not in the UK, so can't provide a reference, but any reputable garage that handles glass/windshield replacements should be able to handle.
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