No payment, no service, no solutions

As a medical service provider, I supp**** this medical aid with my banking details a month ago. After multiple follow up phone calls from my side, they confirmed over the phone, that it has been uploaded on their system eventually. (this was Wednesday 2 weeks ago) Due to them being administered by Medscheme, who already has my bank details, this should not have been a problem. I would have been paid last week Wednesday the latest (as per the person I spoke to 2 weeks ago. Cannot remember the name). I didn't ask for a reference number as he said he will send me confirmation straight away. He obviously didn't. Today, I spoke to another agent, who didn't know how to handle the query. She offered no solution and said that my details weren't updated. As before, she used the excuse of change of administrators. I told her that I have heard it before and explained why I am not accepting this excuse. I don't know who to believe. Furthermore, her manager, who she doesn't know the surname of, was in a meeting and unable to provide an explanation for lack of service.. Hence, STILL no payment for services rendered. No consistency and no follow through. No solutions. Incompetence/ negligence? I don't know anymore.