[IanHurley]

Unless there was a leak never had any car needing to be regassed of any make. If yours needs replenishing you must have leak somewhere!

 

[IanHurley]

They should have put a dye into your gass so that any leak can be easilly traced, perhaps ask for the car to be properly examined to look for the leak. Personally I would not go to a dealer, their technicians have been on an aircon course but and aircon specialist will have far more experience with sorting these sort of issues