Sending it back, is the way to go, as it should have 300 bar on it. My bottle valve has 300 bar on it, but my fill rig is a different style to yours.
The reason i asked about the sealing, is, the screw you put into the dive bottle is longer on a 300 bar rig than a 232 bar setup, this stops the 232 sealing in a 300 bar bottle.