No more trust in Momentum

I feel like I am really being ********** by Momentum. We had to pay a co-payment for a hospital visit of R4500.00. I have no problem doing this usually. The issue I have is that the hospital account was only R3116,34. so less than the co-payment. Momentum will now not pay for the hospital account because I paid for it, why do I even have medical aid? What I would like from Momentum is a refund for the difference R1383,66. The other issue is I got no communication from Momentum dealing with the above, it took me 6 weeks to get a statement from them and a explanation on the situation. The call center couldn't give me a clear answer on the above problem. What I expect from Momentum is fast processing of a claim and good communication.