You've got to get in and have a sit-down, face-to-face with your lawyer. Tell the secretary that if you don't get a meeting, you will change lawyers. That ought to get his attention.
Your question is a bit unclear, but are you saying that the stated the reason they stopped the TTD is because you were treating with a non-MPN doctor? You should meet with your attorneys as soon as possible, and go over the situation with them. They will be in the best position to advise you here.