Unfair/ ******** practice

I am writing this to express my dissatisfaction with regards to the recent service experienced from Bonitas medical aid. Additional beneficiaries were added to an account I had opened up for my brother without my consent. This then took me from a debit order of R2076.00 to just under R12000.00 without the decency of letting me know that changes had been made and asking if I accept these changes as the account holder from which the payments go off. My older brother called in to enquire about the cost of taking out medical aid from my parents of which it would be a separate policy and they were added to the policy I took out for my younger brother. These changes were made and debit orders updated. I asked that they be removed and was told this was terminated but for end of Aug meaning July and Aug instalments are still due. I then called in on the 30/07/2018 to have this corrected and ask how it happened. I was told that the money would go off on the 01/08/2018 unless I emailed the queries department. I did this and was told well it will go off as an arrears amount but they didn't care that I did not authorise this. This has been going back and forth for 2 weeks and now my brothers account has been suspended even though after reversing the just under R12000.00 taken of I had made a manual payment of R2076.00 that I signed up for. The payment was confirmed as received. I have called countless times and sent lots of emails so need some sort of resolution. I can't afford to not have my brother covered. Please help