Tariff code change

Hospital visits with children are already dreading enough only for pathcare to come and give a R5000 bill afterwards because my medical aid rejects a tariff code. Numerous emails since April back and forward between us but no solution. My medical aid was so kind to advise them that the tariff code used is outdated and no longer in use and gave them the correct one to redo BUT alas no positive feedback, just patient is liable... They don't want to amend a simple claim but instead want to flood me with emails about outstanding bills. This is insane seriously.