I've owned a 2011 UK Fabia vRS Mk 2 from new; just completed 50,000 mls without mechanical issues.  It was never subject to the 34F7 Service Campaign, possibly because the DSG  had mineral, not synthetic, oil initially.  When I've asked about gear oil changes at past services (Allams main dealer for 5 years, then a VW-approved independent) they've consulted the manuals and said No, it's a sealed-for-life box.  The service book recommends at every 4 years/ 60,000 km "Inspect ATF level and quality