Unacceptable attitude & response after BESTMED unauthorised debit order

I pay the medical aid for my brother and I am the person who does all the communications to them. I pay Bestmed via EFT monthly. However they had a "system error" on 20 October and one hell of a ***** up unfolded. They debited my brothers account (which had no funds in) and then credited the amount back into the account. However as no funds were ever taken they again saw their error and debited the account again. OK - so that should be the end of it - they took their money back. - We didn't even know this occurred as he does not use this account at all. But no - on 5 December I received a letter stating that he is suspended. I contacted them to inquire as to why and this process was explained to me to an extent. I asked my brother to get a bank statement so I can see what was going on. And I saw the above on my statement - the very statement shows Bestmed receiving their money back. The accounts/membership people who are not capable to help you put me through from 1 consultant to the next and I emailed the bank statement with all payments to them. I am always the one to contact them as they have no inclination to phone me back. This carried on until last week where I had had enough and demanded to speak to the person doing the recons so I can tell them they do not know what they are doing. WOW!!! The next still boggles me; the arrogant woman I was put through to has the audacity to actually tell me that the bank statement is incorrect - A BANK STATEMENT!!!!! I was then instructed by her to go to the bank as they did not get their money back - I sent my brother and he actually got the Payment Description Details showing ABSA (Bestmeds' bank) made a debit order and that the reference (a Bestmed reference) was correct. I then contacted ABSA who told me that they cannot actually do anything as I am not the client but I sent everything through anyway and was told it could take up to 7 days. I made sure that this woman understands that I will only be paying the membership fee for February until ABSA gets back to me and she assured me that the membership will not be suspended. As true as nuts - guess what SMS I get this morning - MEMBERSHIP SUSPENDED!!! I then sent her a very angry email saying that it is not my work to follow up with Bestmed's bank and I want this whole story sorted and the medical aid reactivated. Then she had an oops - she sent me the email that should have gone to her "senior" which said that the senior should help as I am a difficult woman and I do owe them money - still after all this proof showing I DO NOT OWE A SENT TO BESTMED - I am the difficult WOMAN. Now I receive an email back from ABSA saying that this query should be lodged with Bestmed. I am at my wits end - I have NEVER experienced such bad service in my life and I work in the service industry.