A Vauxhall Corsa of this age would come with a six-year anti-perforation warranty which should cover this issue, unless the door itself was damaged in an accident or by being kerbed. Software updates that are rolled out to all appropriate vehicles are usually free of charge from the manufacturer, but changing the software as a repair may be a different matter. We would suggest raising both matters with the dealer principal, and if you do not get a satisfactory response we would take your complaint to Vauxhall UK.