They didn’t log the claim and 7 months later they tell me that owe them money

I’m having a horrible experience after having a good service. I consulted the Bryanston branch on the 8th of December 2021 and I was told that my procedure would be R2500 of which R1500 can be paid via medical aid. I paid the R1000 at the branch and filled in the form for medical aid details. There were no queries until 20th July 2022, I received an sms that I owe R1500. I asked for the claim number so that I can follow up with my medical aid but didn’t receive much feedback until today 11th January 2023. I received the same sms from ***. I have asked for the claim number once again but now the story has changed. The branch that I used doesn’t consider medical aid payments. I called prior the appointment to avoid such queries and I was assured that they have called my medical aid and all is in order. I’m really annoyed with this now. Clearly they didn’t log the claim, which is not my problem. I did my part and paid the agreed amount.