Refused to assist

I have been a fed health client for the past few years I was just short of a payment of over R900 I needed to take my son to doctor and said it's still early as soon as I'm done I will make the payment they refused as I have had this issue before and they have assisted me , I than went to a doctor payed over R900 and than payed them the R900 and now when I app**** for a refund they rejected me and this is not the first refund they rejected it is always happening to me where I claim a refund they reject it I'm just so tired of these people and will change my medical aid next year to someone better I even regret leaving momentum to join you guys