Not sure that's correct. I get my oxygen, acetylene, and nitrogen bottles refilled all the time at different places. No one has ever asked me where I bought the bottles. I haven't bought Argon yet because I'm just now in the market for it but I don't see why it would be different. Maybe I'm wrong but I guess I will find out soon.Welcome to the forum.
Most gas suppliers will only exchange cylinders they own, they won't touch other people's.
Who owns the cylinder? Is it a rental one or one you've paid a deposit on? You'll need to get it exchanged by whoever your contract is with.
If you bought it outright then unfortunately when it's empty you'll probably need to dispose of it and get another.
That maybe the case in the USA,here in the UK its a different storyNot sure that's correct. I get my oxygen, acetylene, and nitrogen bottles refilled all the time at different places. No one has ever asked me where I bought the bottles. I haven't bought Argon yet because I'm just now in the market for it but I don't see why it would be different. Maybe I'm wrong but I guess I will find out soon.