Momentum refusing to pay PMB

I had a severe otitis media which is a PMB condition and the appropriate PMB code H65.0 was on the invoice therefore the medical aid shall reimburse the patient as it is clearly a PMB condition. Momentum wants further documents from me proofing the PMB condition. I spoke to the Council of Medical Scheme and they said the codes are on the invoice clearly stating the PMB condition so it is not required to get a motivational letter to show it is a PMB. This is just a tactic from Momentum to not settle a claim which by law is payable by the medical aid. H65.0 is a PMB. I am upset. After weeks of waiting and correspondence back and forth I get this reply. Not acceptable Momentum