I was able to go to MD Fire Equipement in Rockville where they filled it up. The tank was still good so they did not need to hydro test it, which they do. They did not even look if there was a company stamp on it as far as i am aware. It was $36 in the end to get it filled.
Have you tried exchanging your tank at Roberts Oxygen? They wouldnt take mine since it had a coca cola stamp on it.
In am off of Strawberry Knoll.