Discovery Health Pre-authorisation

My daughter app**** for pre-authorisation for a home birth, giving the estimated date of birth. It turns out that Discovery loads the authorisation for that date only! The birth happened some 10 days later and when the claim was submitted it was rejected and she was only paid out from her MSA. Discovery made no attempt to advise why the claim was rejected and they rely on the member to follow-up and ask the question. This is exceptionally poor customer service.