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Removing the valve doesn't necessarily mean it's not O2 clean anymore, most tanks are not o2 cleaned and assembled in a sealed 'clean room,' they're done in probably the exact same spot as where they did yours.
They have the right to not fill your tank, especially if they feel it isn't safe for them. Pure O2 is not something to play around with, take chances, or to not take seriously. There is no law that says they have to fill any tank regardless of its condition and no moral "code" that requires them to do so either.
That said, there is also no reason for them to remove your valve without asking you. My understanding (i'm not a tank inspector) is that if your tank is bowed, it's no longer considered safe and I doubt a hydro would fix that (again I'm not an expert and could be wrong). I'm not sure they have the right to arbitrarily condemn a tank either. Either way I'd be pissed off if they did anything other than just say no and returned it to me.
Jack
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