Not a trust worthy medical aid

I was cheated. I called the Discovery Medical Aid on 21st June 2024, requesting for a medical aid plan, during that call I asked the sales guy to keep the premium debit date to 10th of every month, he advised me to send an email to him and also acknowledged that he will set the debit date as requested. He also said, for any future queries I can send an email to the same email address, he will assist. On 1st of August, premium got debited from my account, instead of 10th august, I was shocked. On the same day before checking my bank account, I have sent an email to the sales person with some other query. I waited for his response till 13 august, since there was no response, I called the Discovery Medical aid customer care and narrated the situation and also the debit date issue. That executive said that she will process my request and put my call on hold, since I already spent around 44 minutes on the call, my airtime was over then the call got disconnected. I thought I and going to get a call back from that executive, since I didn't get any call, I have responded to the survey with 0 rating. Today, i.e., 15-Aug, I have received a call from Discovery medical aid asking the reason behind my rating, I narrated my situation again. After listening to everything, the executive said they can change the debit order data to 10th of every month, however, in the month of september the full premium would get debited twice i.e., on 1st of September and again on 10th of September. I was shocked and asked them why, as the premium is debited in Arrears and if they debit the full premium again on 10th septermber after debiting on 1st september, how come it becomes debiting in Arrears, it will be debiting for future. I have requested them of they can debit only for 10 days on 10 september, and from 10 October onwards they can debit for 30 days arrears every month 10th. Alternately, I have asked them to Debit only once on September ie., 10th September for 40 days ie.. for August + 10 days in September. In both the scenarios, it would logically become debiting in Arrears. Even though, my suggestions are reasonable, the executive was very rude and said Discovery can't take any risk. I don't understand what's the risk there, they says they will debit in arrears, but by debiting twice for the month of september, they are debiting for future. Don't understand how logical it is. This is pure cheating