Momentum Health's Communication is bad with paying members

I moved to Momentum Health because they are a 'big and professional' medical aid. They can't communicate properly and neither sent authorization numbers on an official document. They only sent authorization numbers via email and do not settle bills as per authorization number. I had sent an SCP MRI bill R 17 818.63 to them after they requested the payment from me. Ref: Authorization nr: ***. This is a lot of money and the medical is expensive every month. I wanted peace of mind, but sadly this is not the case. Please communicate properly with your members?