Disgusted with service and response

We have an issue with a claim that we have submitted. Of the bill of R 43000 they are only paying R9000. Firstly they are rejecting bills due to codes. After talking to the doctor he assures me that the codes are correct. After trying to contact Discovery, we have to wait more than 3 minutes before we can be put through to a call centre agent. Then when we finally get put through the calls keep being cut. this is totally unacceptable. Why are we paying for such **** poor service. We have not received an updated statement from them to show what the last payment was for. all we received was a payment of R 4000 not referring to any particular line item on the bill. This is totally unacceptable and not on. We even sent through the quote from the doctor before my wife went ahead with the procedures so that we could get authorization for this. Authorization was granted and now we are being pushed from pillar to post in trying to get this resolved. Not happy at all