Supplier not Paid

On 28/05/2025 my optometrist submit a claim for purchases with them for R2800 to the medical aid. My account was debited but the supplier was not paid, on arrival to pick up my parcel I was notified that there were not enough funds and I had to paid again. I spoke to Discovery Bank then they transfer me to the Medical Aid, then I explain to the medical aid what happened then they transfer me back to the Bank. I send them proof of all these transactions and then they send me a reference code. when I phone in again as the money is still not back into my account, I have to explain this again and that is now going on for more than 7 months.