Not paying claims because of error on their side and no feedback

I ran out of savings. I'm on a plan with the day to day extender benefit so I looked on the discovery website to see if the GP is covered. According to the information the GP is fully covered.(this link by the way does NOT work https://www.discovery.co.za/portal/individual-content/tooltip-premier-plus-gp-network please fix your system). I received an invoice but discovery did not pay the claim. I phoned the doctor and the lady at reception told me that discovery forgot to add them to the list this year. No one informed me of this. Who is going to take the blame for this issue as it was clearly not my fault? Your system stating the provider has full network coverage but the link not working? The provider not giving me timely information about this? Clearly everyone is just trying to pass the buck here. Please come with a solution and pay my claim or else I will make this a major issue.