Call Centre doesn't update or call back or resolve queries

Discovery's call centre is completely clueless on the benefits it provides. We had phoned in prior to doing some lab work and were advised that Discovery would pay only to find out that the claims were rejected subsequently. I have called on 3 occasions and have not been helped in anyway. All agents promised to call me back within a day or two and up till now nobody has called. Yet they have our full profile, recordings of all calls and of course our sizable monthly premium which we honor month in and month out. Terrible service, just phone me, sort our my issues and let's move on.