Discovery's poor service and consultant advice

I am a end stage/ stage 5 Kidney failure patient who recently had a kidney transplant at the age of 25 years old. Before the transplant I had to upgrade my medical aid so that all costs would be covered by the medical aid and took the advice of the discovery consultant as they promised me that everything would be covered if I pick the specific plan. Now I am receiving bills from various health providers and emails from Discovery that the claims would not be paid due to various reasons. I am unemployed and not eligible to work for 3 months as I am in the post recovering of the kidney transplant and not allowed to work. They do nothing from their side to help and I followed their advice from their personell and I now have to sort out everything.