Medical Aid - very disappointed

I app**** for a Discovery Medical aid in February (starting date 01 March 2015). On the application form was my bank details. At the end of March (date that the debit order should've went off), it didn't went off. I called Discovery to find out if the debit order went off and they said yes it did. So I wasn't worried at all. In June I drew a statement from my bank and saw there wasn't any debit orders from March. I called Discovery and they apologised and that they put me under employer instead of individual. They've never let me know that the debit orders didn't went off - I had to found it out by myself. I didn't receive any communication from Discovery. Then they didn't even wanted to change my inception date to the 1st of June. Then I said I want to cancel my membership because it was utterly bad service. They told me that the last premium will go off on the 1st of July 2015 (which is only June's premium (R 1 294) and I was willing to pay and agreed). By the 2nd of July there went off R 5 176 from my bank account (premiums form March to June) after the lady I spoke to assured me that only June's premium will be taken. This is unacceptable.