Poor service from Medihelp

On the 26th of January I was referred for a NIPT Non-Invasive Prenatal blood test as my first blood test indicated a very high risk for chromosome abnormalities. As this is a very expensive blood test I first consulted with the medical aid and requested a authorization number. However I was told that I did not need an authorization number and that there is funds available for this test. I asked if this is not excluded and I was told that it is not. When the account was sent to the medical aid, they requested a motivation from my doctor which I emailed. After a telephonic conversation with a consultant at the medical aid (two separate occasions) they confirmed that they will be paying R5502. Which also reflected on my statement 24 March 2021. However I received an email and call from Ampath stating that the payment was withdrawn as this test was excluded. I think this is shocking and how can a medical aid confirm payment and then withdraw it.