What a mess

Earlier in the year I changed plans. Have all the correspondence to prove it. Now there is a hugh mess with my payments. One month the debit order didn't go off, next month debit order went off but money was allocated to a previous month. New payment gone off but now according to the call Centre the plan was not changed, medical aid has been suspended, I got a declaration letter to complete but on the old plan not the new one. I have paid but now my medical aid is suspended but on the old plan. New plan details gone missing. Every time I call I get put on hold and the call drops. No one bothers to call back. Pathetic service. Can someone call me on ***