Healthcare provider claim

For the 4th time I have had a claim rejected by GEMS - firstly due to no proof of payment, then due to the amended statemen apparently being a duplicate, and the second two (different) due to services not being covered . My client is a GEMS Onyx member, and according to the benefit guide they are covered for psychologists. I am a psychologist, yet the services I have charged for are being deemed not covered. I demand that this is sorted out earliest - I am so tired of calling your call centre and being told different stories about why the claim is being rejected. Claire Maher Practice Number ***