Discovery Medical Aid's poor service

In December 2022, I became a member of Discovery Medical Aid. In February 2023 Discovery phoned me to inform me that they have already cancelled by membership as I am not paying. After sending them the proof of payment for every month, they indicated that they will pay back the money. They also indicated that it will take 2 -3 working days. A few days later I received an e-mail indicating that they will pay back the money before the 20th of the month (almost a month later). I wrote a reply to indicate that this is unacceptable. However, they never responded. The 20th of the month I had to phone them again to find out why they are not paying. I was informed that they have closed the matter. They now want me to prove that they did not pay instead of sending me a proof of payment. I have now had it with Discovery. They have treated me extremely poorly. Their service of of such pathetic quality that I will never want anything to do with any of the companies or products.