No communication from Optivest

About 2 years ago I've changed to a new medical aid, and through my connection with Old Mutual, I've decided to appoint Optivest Health Services as my broker. After accepting the quote for my medical aid plan, I've realized that they deduct an admin fee every month (just under R100), a fee that I still do not see any notes on in my contract. Since the beginning I've always struggled to get a hold of them, my broker (which changed 3 times in the course of the 2 years) never available at her direct telephone line, and not responding to emails with regards to claims and authorisations. With every single claim, I always had to send an email, follow up twice (which no-one ever rep**** to) and then phone twice, leaving messages at the reception. Now I've decided to cancel my contract with them, and remove them as my broker. They need a month's notice to cancel my contract, by they are immediately removed as broker, so technically that means that I'm paying for the month in advance for their admin fee, but getting no service / advice from them at all for the payment. Not that I've ever received service for the amount that they deducted from my bank account (without my knowledge beforehand.) Even the sent document I had to fill in to cancel my contract, has not yet been confirmed as received, so will they then take money from my account again if the month notice of cancellation falls over month-end, because of their lack of communication? Again, I still don't know what I paid for every month, because I've dealt directly with my medical aid on occasion, and received more help from them, than my appointed and paid for broker.