Claims not being paid from correct fund

After 7 successive calls to Discovery to get a claim honored (during my Self Payment Gap) as it was supposed to have been done, I eventually wrote a review on Hello Peter in September 2017, after which the claims were paid. What I didn't see at the time was that the claims were then paid from my Above Threshold Benefit as I had got through my SPG by that time. I followed up via email, only to be told the Dr was not part of the Premier Network. I checked on the web, and he is. Rep**** to email, with screenshot, only to be told the same garbage again. I then phoned the customer care number, and was informed by the agent that the Dr is in fact on the Premier Network. Emailed again, no response. Discovery claims department are useless.