I'm not sure if "bottom of the bark" and "back to the bark where the new green leaves are growing,"means near the ground?If it does and there is no top growth(leaves and new shoots)then probably the graft failed and the rootstock is still alive.
Try scraping a little bark off in different areas from the top part of the tree with your fingernail or knife and check for green.If it is,then that part is still alive.If brown,then it's dead at that level and keep going down the tree to the graft union.If there is no green above the graft,it's dead and about the only thing to do is cut it down and start over or graft another variety onto the rootstock as the rootstock probably won't produce good fruit. Brady