Cancellation of Medical Aid

I sent an email requesting how I go about cancelling my medical aid. My initial email was responded to within 24 hrs advising that no forms had to be completed ALL I had to do was respond \Yes\" to that email. I was extremely impressed by the response time. I responded a few days later to the email, confirming my cancellation. I then received another email to advise that the email address I was emailing from was not recorded on their side and that I had to provide the correct one, I responded again. Again I received another email advising this was still the \"incorrect\" email. I have now responded for the THIRD time requesting to cancel it and STILL havent received any response. I pay over R2600 per month and I dont think it is unreasonable to ask that this simple request be processed. The reason for cancelling is I am unable to afford the premiums any longer my fear is now that I will be forced to pay another premium and the new lower premium of the new medical aid in the same month. "