PAYING CLAIMS-always an issue!!

I have submitted claims with you people, you always pay incorrectly or to the Dr after I submitted an invoice to confirm I already made payment for service. Why else would I submit the claim? You always take long to process claims, we have to make endless calls to you about these claims and basically spend the equivalent of the amount we've claimed on calls to you people to sort out the issues. I made a call to you on Tuesday 30th March and Alutha was supposed to get back to me within 2-3 working days, I called back on Friday, an email was sent to him to call me back, he didn't. All this because of an error made by discovery. Secondly I submitted another claim, you paid it to the service provider, but I sent through the relevant docs to confirm service was paid for already. I am yet to receive feedback. It's always an issue with you people. I've never had issues with Momentum when it came to claims but discovery is the worst.