Incorrect billing

I'm currently not happy as I think western cape blood transfusion services has incorrectly billed my medical aid for my premature baby that's still in hospital. My medical aid covers all blood services at unlimited in hospital and according to the claim status email I have received it shows that benefit limit has been reached. I'm almost certain that the billing was done out of hospital when it's actually in hospital. I am under alot of stress as all the bloods required is for under weight and sized premature baby that's just been an entire colon removal .I honestly do not have the time as every waking moment involves me at work and hospital. I'd like the matter to get looked into now before making a bigger issue when it could actually just be a simple error made by accident. It happens to even the best of people. I will re look at the review staring later