Hospital did authentication incorrectly and doesn't fix it

My wife gave birth and my child was in the NICU for a couple of days last year. The hospital sent through authentication requests to the medical aid being Bonitas with different discharge dates even tho both was discharged on the same day and within 1 hour, we drove together home. Hospital refuses to contact the medical aid and the medical aid refuses to contact the hospital. Some of the tests was reversed since according to the authorisation the patient wasn't admitted. I even drove to the hospital the one day so that I can make the call and use my phone just to be told the people are not there but far away. Nobody wants to assist me.