PATHETIC service

On the 3rd of February 2024 I took my daughter to Life Mercantile ER. When I got there I gave them my physical medical aid card with my daughters details on. They proceeded to assist her and took xrays and we left. The next day my mother rexieves a claims notification that mercantile tried to claim for my daughters visit on her medical aid as my daughter was previously on my moms medical aid. The ER doctor and the radiologist claimed from my medical aid. On the 5th of February I fell and went to Life Mercantile, before I left i told them about my daughters account and i told them to remove my mothers details from my daughters file as she is no longer on her medical aid. I again gave them my medical aid card and asked them to claim from the correct medical aid. A few days later my mother receives a notification that they tried to claim from her medical aid which is obviously not going to pay because the child is not on that medical aid. When I contacted them they said its because they can't pick her up on their system , I again sent multiple emails with the membership certificate showing my daughter on my medical aid yet they insist they cant pick her up on their system. My question to them is why are they the only providers that cant pick my daughter up on their system. The ER doctor could claim using the details I gave them why could the radiologist claim using the details the same details they have. I claim monthly chronic medication for my daughter with no issues, secondly if they cant pick my daughter up on their system why cant they pick up the phone and call the medical aid and see what is going on. Clearly the problem is with their system because all other providers could claim that day except them. Now they are sending final letters of demands for something that have been in constant communication with them about and being promised it would be sorted. I have never had any issues with Life Mercantile and this situation is very disappointing. I need this sorted ASAP or im lodging a complaint with the OHSC.