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@BrickMan
Polo 6r that I borrowed with essentially zero miles on it, AC doesn't work either, computer shows a fault code stored some years ago when it dropped below min plausible pressure.
Just done 300 miles in it and now it has a manifold gasket blowing a little, nice little tick tick sound at light load.
For doing AC right, 100% take it to someone who does it regular, it is kinda hard to mess up, as the machine is semi-automated, it draws down a vacuum first to ensure no obvious leaks, which evacuates the old PAG oil (goes crystalline over time, or just gets nasty TBH), then if it holds the pressure for a given time, pumps in refrigerant and PAG oil in the right quantities. Then run the system and whether its a single fill valve or a high + low valve system the machine monitors the two and makes sure its in range, then gives you a print out. So long as nothing mechanically wrong with the system should be fine. Will leak bright green dye if there is any leaks.
Those refrigerant in a can jobs are only a bandaid type job, they contain a bit of oil.