Go to your Community folder, then one folder up (Packages) and then into Official folder. There you should find A320 by FBW that was installed through Marketplace. Delete it. Then go to your Community folder again, this time three folders up (Microsoft.FlightSimulator_8wekyb3d8bbwe) then LocalState → Packages and again delete anything that might look related to FBW A320. Reinstall and you should be fine.