The dry clutch DSG7 has had a lot of problems the commonest of which was due to having been filled with synthetic oil on the production line because when this gets very hot it becomes conductive and fuses the Mechatronics unit. The worldwide service bulletin was to replace the synthetic oil with mineral oil, but this only applied to DSG7 from 2010 to 2013. All dual clutch transmissions require a routine change of transmission fluid anyway every 3 - 4 years. The Altea XL is dated from 2007, but you did not state how old yours is. Supplier and manufacturer liability generally ends after 6 years. For a cheaper fix than the ridiculous £6500, tray a member of www.fedauto.co.uk