Not paying Claims

I am a client with keyhealth medical and are registered for oncology as well as COPD, my oncologist requested some blood test to be done, and as a patient, I did as she requested. We did use my ICD10 code C80.9 and made sure that lancet add it on all the invoices. My medical aid rejected all the claims. I di call them about 10 times to query it, and I was explained that I need to see what is covered in my oncology basket, as they call it. But nowhere is a list of what is covered and what not, I did ask them and even they don’t know what is in the basket, as it only say non-active pathology and non-active radiology. How must I as a patient know what codes means what and what is covered. After many contacting them a couple of times, I was told they will send it for resubmission. This is 2 months down the line and it is still not paid. Also my specialist who did a lung function test under my ICD10 code J44.9 was not paid. Why keyhealth, I am paying you and never miss any payments. I am tired of always fighting for you to settle my claims. Please sort this out.