Bad service

The service i have been receiving is unhelpful and uncaring from Lancet .There was an account sent to medical aid incorrectly i have been following up and requesting lancet to correct this however till today after 3 months we have been advised this will be correct however it has not .i was called and sent messages everyday to pay the account even though Lancet was wrong ,i paid the account and now they delaying and sending me from pillar to post as they do not want to pay the money back. I need this to be resolved all Lancet has to do is change the record from out of hospital to in hospital as the necessary information was provided by the doctor.