Discovery not communicating well at all!

So dissapointed with the lack of clarity and communication from Discovery. I am pregnant and I have been seeing my gynaecologist as scheduled. The gynae has booked me for blood tests as the 13 week scan needs to be accompanied by tests to confirm the baby's health and whether it is tracking along nicely. Went there on the scheduled 27th and was directed to Lancet Laboratory at Garden City. Now they do not want to run my blood tests as Discovery does not want to pay for my blood tests and I appatently should have got prior authentication. This is ridiculous, as it is a required step during my pregnancy. Done by a gynecologist on their network and I feel the gynae and Discovery should be communicating. It is not my job to keep them informed every step. I have a medical aid I pay for and I expect a certain level of service especially as it pertains to my medical benefits. Do better or else I would be forced to shop around after delivering.