Anglovaal/Discovery do not pay providers

I treated a patient in the hospital member ***, unfortunately the amount charged was Discovery rates and not Anglovaal as Discovery does their admin I thought it was Discovery rates. They paid the member out and not the Provider. When I contacted them they said I needed to change the amounts charged and resubmit the account and they would pay the money to me. I did this and nothing was done. I was told on calling them that I need to contact the member and the member must pay over. I only have contact details for Linda who says it is not her responsibility and that the father has been retrenched and thus does not have the money to pay us. When I contacted the medical aid they don't care and just say I must hand the member over to the debt collector and there is nothing more they can do. If they had not paid the member in the first place this would never have happened. I have signed contract with Discovery in 2006 where it clearly stated that Discovery would pay the provider regardless of the amounts charged and not the member. But they have not kept their word and keep paything the members and we do not see our money, even though we try hard to charge correct amounts.